Limnic eruptions, lake overturn, and CO2 gas evacuation¶

A limnic eruption represents one of the rarest, quietest, and most lethal natural phenomena on Earth. Also known as a lake overturn or exploding lake disaster, this catastrophe occurs when immense volumes of dissolved carbon dioxide gas, supersaturated under deep hydrostatic pressure within meromictic volcanic lakes, suddenly exsolve and erupt into the atmosphere. The resulting gas release creates an invisible, cold, heavy gas cloud that displaces breathable air, flows like a liquid down surrounding drainage channels, and suffocates thousands of people, livestock, and wildlife across distances exceeding 25 kilometers (15 miles) from the lake shore.

Unlike explosive volcanic eruptions that produce incandescent ash plumes, roaring seismic tremors, and daylight-blocking tephra clouds, a limnic eruption gives little to no visual warning. The gas cloud is odorless, colorless, and silent, often accompanied only by a dull subterranean rumble, a foaming water fountain, or a thin white vapor mist caused by adiabatic cooling. Because carbon dioxide is one and a half times heavier than ambient air, it clings tightly to terrain depressions, filling valleys, dry streambeds, and homes. Surviving a lake overturn depends entirely on recognizing subtle sensory warning cues, immediately abandoning low-lying terrain, and climbing uphill to higher elevation on foot before loss of consciousness occurs.

Enza nunku mpindieu¶

1. Sprint uphill immediately to gain vertical elevation:
   • Climb the nearest hill, ridge, or steep topographic promontory the instant you notice gas symptoms, strange lake foaming, or stalled engines.
   • Gain at least 30 meters to 50 meters (100 feet to 164 feet) of vertical elevation above surrounding valley floors and stream gullies.
   • Move across the slope rather than running down valley drainage channels, because heavy carbon dioxide flows along the paths of least resistance like water.
2. Abandon stalled motor vehicles immediately on foot:
   • Evacuate your vehicle the moment the internal combustion engine sputters, loses power, or stalls without apparent mechanical cause.
   • Do not waste time attempting to restart a stalled engine, as internal combustion requires oxygen that has been displaced by carbon dioxide.
   • Run uphill immediately, assisting passengers and abandoning all heavy luggage, supplies, and personal belongings inside the car.
3. Never seek shelter in basements, ditches, or ground depressions:
   • Avoid descending into subterranean basements, storm cellars, root cellars, riverbeds, roadside ditches, or valley bottoms.
   • Move to the highest accessible floor or rooftop if trapped inside a multistory building and unable to escape uphill outdoors.
   • Remember that carbon dioxide settles downward, displacing oxygen from ground level upward and creating lethal concentration pools in enclosed low spaces.
4. Recognize acute physiological and environmental warning indicators:
   • Notice sharp, stinging sensations on your tongue, throat, and mucous membranes caused by carbon dioxide forming carbonic acid in saliva.
   • Watch for rapid breathing, unprovoked shortness of breath, dizziness, confusion, throbbing headaches, and visual disturbances.
   • Observe unnatural silence in the environment, such as the sudden cessation of insect sounds, bird calls, and farm animal noises.
5. Administer high-flow oxygen and perform rescue breathing above the gas layer:
   • Move incapacitated individuals uphill into uncontaminated air before attempting medical assessment or resuscitation.
   • Check for pulse and spontaneous respiration, initiating cardiopulmonary resuscitation and rescue breaths immediately if breathing has stopped.
   • Administer 100 percent supplemental medical oxygen through a non-rebreather mask to displace dissolved carbon dioxide and treat systemic hypercapnia.

flowchart TD
    A["Sudden Limnic Overturn: Deep Volcanic Lake Releases Millions of Tons of CO2"] --> B["Warning Window: Seconds to Minutes Before Valley Asphyxiation"]
    B --> C{"What Immediate Warning Signs Are Present?"}
    C -- "Engine Stalls, Acidic Taste, Breathlessness" --> D["Abandon Vehicle & Sprint Directly Uphill On Foot"]
    C -- "Rumble Heard, White Ground Mist Advancing" --> E["Climb Perpendicular to Valley Axis toward Ridges"]
    D --> F["Gain At Least 30 to 50 Meters Vertical Elevation"]
    E --> F
    F --> G{"Are You Above the Cold Heavy Gas Inversion Layer?"}
    G -- "Yes: Air Becomes Clear & Breathing Normalizes" --> H["Remain on High Ridge; Monitor VHF/Radio for Advisories"]
    G -- "No: Stinging Sensation & Dyspnea Persist" --> I["Continue Climbing Immediately to Higher Peak"]

Physical Chemistry of Limnic Eruptions and Lake Stratification¶

A limnic eruption is fundamentally a physical-chemical event governed by gas solubility, fluid mechanics, and density stratification in deep aquatic bodies. To understand why a lake erupts with gas, one must examine the behavior of dissolved gases under high hydrostatic pressure, a principle described by Henry's law.

Henry's law states that at a constant temperature, the amount of a given gas dissolved in a given type and volume of liquid is directly proportional to the partial pressure of that gas in equilibrium with that liquid. In deep volcanic lakes, groundwater passing through underlying magmatic fissures absorbs volcanic carbon dioxide gas originating from deep mantle degassing. This carbonated fluid enters the deepest layers of the lake, known as the hypolimnion.

In typical lakes in temperate climates, seasonal temperature changes drive annual water turnover, mixing top and bottom layers and allowing dissolved gases to escape gradually into the atmosphere. However, in tropical volcanic crater lakes, specific physical factors prevent this natural ventilation:

• Meromictic Stratification: Tropical crater lakes often exhibit permanent stratification, where the water column is divided into an upper layer (epilimnion) and an isolated deep layer (hypolimnion) that never naturally mix. The epilimnion remains warm and less dense, acting as a buoyant thermal lid that traps the colder, denser, mineral-laden deep water beneath it.
• Immense Hydrostatic Containment: At depths of 200 meters (656 feet), the hydrostatic pressure of the water column exceeds 2 megapascals (20 atmospheres or 290 pounds per square inch). Under this pressure, water can hold immense volumes of dissolved carbon dioxide in solution without forming bubbles, much like an unopened bottle of carbonated champagne or sparkling water.
• Super-Saturation Equilibrium: Over decades or centuries, magmatic degassing charges the hypolimnion until gas saturation levels approach 100 percent. The deep water becomes a pressurized chemical reservoir holding hundreds of millions of cubic meters of dissolved gas waiting for a trigger to disrupt its equilibrium.

A limnic eruption begins when an external physical disturbance displaces a portion of this supersaturated deep water upward:

• Trigger Events: Sublacustrine landslides along steep crater caldera walls, seismic ground shaking from local tectonic faulting, severe torrential rainfall cooling surface layers, or intense wind shear can push supersaturated deep water upward toward shallower depths.
• Bubble Nucleation and Cavitation: As a parcel of deep water ascends, surrounding hydrostatic pressure decreases. Once pressure drops below the gas saturation threshold, dissolved carbon dioxide begins to nucleate into microscopic bubbles, exsolving from the liquid phase.
• Runaway Buoyancy and Volumetric Expansion: When gas comes out of solution, the bulk density of the water-gas mixture drops dramatically. The bubbly fluid becomes highly buoyant compared to the surrounding water column, accelerating violently toward the surface. As it ascends, pressure drops further, expanding bubble volume exponentially.
• Limnic Water Fountain and Gas Release: The accelerating column erupts at the lake surface as a massive geyser or limnic fountain, projecting water and gas hundreds of meters into the air. This violent upward suction draws millions of tons of adjacent deep water upward in a catastrophic chain reaction, completely degassing the deep reservoir within minutes.

Fluid Dynamics of Cold Dense Carbon Dioxide Clouds¶

Once released into the atmosphere, the carbon dioxide gas cloud behaves according to the laws of heavy gas dispersion and gravity currents. Carbon dioxide has a molecular weight of 44 grams per mole, compared to approximately 29 grams per mole for ambient air, making pure carbon dioxide approximately 1.52 times denser than air at identical temperature and pressure.

The physical behavior of the cloud is dictated by several thermodynamic and environmental factors:

• Adiabatic Cooling: When compressed carbon dioxide exsolves from water and expands rapidly into atmospheric pressure, it experiences intense adiabatic cooling, known as the Joule-Thomson effect. The gas temperature drops sharply, often approaching freezing temperatures. Because cold gas is significantly denser than warm gas, this thermal drop increases the cloud's bulk density to 1.7 to 2.0 times that of the surrounding tropical atmosphere.
• Gravity Current Propagation: The cold, dense gas forms a ground-hugging gravity current. Instead of dissipating or rising into the upper atmosphere, the gas spreads outward along the surface of the earth. It follows terrain gradients precisely like liquid water, draining down topographic slopes, pouring over cliff edges as gas waterfalls, and filling river gorges and dry streambeds.
• Inversion Layers and Laminar Valley Flow: In mountainous volcanic regions, nighttime atmospheric temperature inversions often trap cold valley air beneath warmer air layers. When a dense carbon dioxide gravity current enters a mountain valley under inversion conditions, it displaces the ambient air upward, establishing a laminar, low-turbulence flow that preserves gas concentrations above lethal thresholds for tens of kilometers downstream.
• Formation of White Aerosol Fog: Although carbon dioxide gas is naturally invisible and colorless, the severe cold produced during rapid gas exsolution condenses ambient atmospheric humidity into a dense white mist or aerosol fog. This condensation creates a visible ground-hugging white cloud that accompanies the leading edge of the gas surge, providing an immediate visual marker of the advancing hazard.

Physiological Effects and Toxicology of Carbon Dioxide¶

Public perception frequently confuses carbon dioxide (CO2) with carbon monoxide (CO), or assumes that carbon dioxide acts merely as a simple asphyxiant that dilutes oxygen. In reality, carbon dioxide is a potent systemic toxin that produces profound physiological derangements independent of oxygen concentration.

When inhaled at elevated concentrations, carbon dioxide diffuses rapidly across alveolar membranes into the pulmonary capillary blood, causing acute respiratory acidosis and systemic hypercapnia:

The specific toxicological mechanisms of carbon dioxide toxicity include:

• Acute Hypercapnic Acidosis: Carbon dioxide dissolves in blood plasma, reacting with water to form carbonic acid, which dissociates into hydrogen ions and bicarbonate. At high inhaled concentrations, arterial blood pH drops rapidly from the normal range of 7.35 to 7.45 down to lethal levels below 6.8 within minutes. This profound acidosis disrupts cellular enzymatic function, causes lethal cardiac arrhythmias, and triggers peripheral vasodilation with cerebral vasoconstriction.
• Cerebral Hypoxia and Anesthesia: Carbon dioxide acts directly on the central nervous system as a potent anesthetic and neurotoxin. At concentrations exceeding 10 percent, it suppresses cortical neuronal firing, producing immediate stupor and unresponsiveness. Victims collapse without recognizing the danger, appearing to fall asleep instantaneously.
• Respiratory Drive Paralysis: Under normal physiology, blood carbon dioxide levels regulate the autonomic respiratory drive via central chemoreceptors in the medulla oblongata. When arterial carbon dioxide tension rises to extreme levels, the medullary respiratory center becomes paralyzed, halting spontaneous breathing efforts even if supplemental oxygen is subsequently provided.
• Thermal Shock and Mucous Membrane Acidification: Inhaling cold carbon dioxide gas produces intense local irritation. When the gas contacts moisture in the mouth, nasal passages, and trachea, it instantly generates concentrated carbonic acid, producing a distinct sour, metallic, or stinging sensation that serves as an important sensory warning indicator.

Real-World Case Studies: Lake Nyos and Lake Monoun¶

The historical reality of limnic gas eruptions was confirmed through two catastrophic events in the West African nation of Cameroon during the 1980s. These disasters established the scientific discipline of limnic volcanology and provided critical data on human survival factors.

+----------------------------------------------------------------------------------------------------+
|                                  HISTORICAL LIMNIC DISASTER AUDIT                                  |
+----------------------------------------------------------------------------------------------------+
| 1984 Lake Monoun (Cameroon): 37 fatalities along low river road; vehicle stalled in 5m gas pool    |
| 1986 Lake Nyos (Cameroon): 1,746 dead, 3,500 cattle suffocated across 25km downstream valley      |
| Lake Kivu (Rwanda / DRC): 300 cubic km CO2 + 60 cubic km CH4 trapped; 2 million residents at risk  |
| Degassing Pipe Systems: Auto-siphons installed at Nyos (2001) and Monoun (2003) to prevent recharge|
+----------------------------------------------------------------------------------------------------+

The Lake Monoun Disaster (August 15, 1984)¶

On the evening of August 15, 1984, Lake Monoun, a volcanic crater lake located in western Cameroon, experienced a sudden limnic overturn. A cloud of carbon dioxide erupted from the lake surface, accompanied by a loud noise and a 5-meter (16-foot) water wave that flattened shoreline vegetation.

The gas cloud settled into a low-lying river valley along a roadway connecting local villages. Early the following morning, thirty-seven people traveling along the road entered the invisible gas pool and died.

A commercial passenger truck carrying twelve people entered the depression, where the engine stalled immediately due to oxygen starvation. Passengers who stepped out of the truck to investigate collapsed on the roadbed and suffocated within minutes. Those who survived were located on higher terrain along the road shoulders where gas concentrations remained below lethal thresholds.

The Lake Nyos Catastrophe (August 21, 1986)¶

Two years later, on the night of August 21, 1986, a catastrophic limnic eruption occurred at Lake Nyos, a deep volcanic crater lake situated in northwestern Cameroon. An estimated 1.2 million metric tons (roughly 100 million cubic meters) of carbon dioxide erupted violently from the lake bed. The event threw a massive water fountain over 100 meters (328 feet) into the air, generating a 25-meter (82-foot) tsunami that stripped trees and soil along the crater rim.

The dense carbon dioxide cloud poured over the lake outlet spillway and cascaded into two deep valleys below. The cloud moved down the valleys at speeds between 20 kilometers per hour and 50 kilometers per hour (12 miles per hour and 31 miles per hour), hugging the valley floor and displacing all breathable air. The gas traveled over 25 kilometers (15 miles) from the lake, devastating the villages of Nyos, Subum, Cha, and Fang.

The disaster resulted in 1,746 documented human fatalities and the asphyxiation of over 3,500 cattle, goats, dogs, and birds. Every insect, lizard, and wild animal along the valley floor was killed, leaving the valley eerily silent. Forensic investigators found victims lying where they had been sleeping, gathered around cooking hearths, or collapsed along pathways.

Survivors of the Lake Nyos disaster shared consistent survival characteristics:

• High-Ground Positioning: Those who survived inside the affected villages were located on elevated topographic knolls, hillslopes, or the second stories of houses where the top of the gas cloud did not reach.
• Awakening and Sensation of Warmth or Acid: Several survivors reported waking during the night with an acute sensation of warmth, breathing difficulty, and a sharp, acidic taste on their tongues. Those who immediately climbed up surrounding hillsides survived; those who walked outside to check on neighbors collapsed in low ditches and died.
• Delayed Awakening: In peripheral zones, some residents remained unconscious for up to 36 hours due to sub-lethal carbon dioxide narcosis, awakening with severe headaches, respiratory burns, and transient paralysis.

The Looming Hazard of Lake Kivu¶

While Lake Nyos and Lake Monoun are relatively small crater lakes, Lake Kivu, situated on the border between Rwanda and the Democratic Republic of the Congo in the East African Rift, presents a potential hazard of unprecedented scale. Lake Kivu is 1,000 times larger than Lake Nyos, with a depth exceeding 480 meters (1,575 feet).

Geochemical surveys confirm that Lake Kivu holds approximately 300 cubic kilometers (72 cubic miles) of dissolved carbon dioxide and 60 cubic kilometers (14 cubic miles) of dissolved methane trapped under immense pressure. More than two million people reside along its shores, including the major urban centers of Goma and Bukavu. If an active volcanic eruption from neighboring Mount Nyiragongo injects hot lava into the deep gas-rich layers of Lake Kivu, it could trigger a limnic overturn capable of releasing an immense gas cloud that could suffocate the entire regional population.

Vehicle Mechanics in Oxygen-Deficient Atmospheres¶

Understanding how motor vehicles respond inside a carbon dioxide gas cloud is critical for preventing entrapment and fatal decision-making during an evacuation.

Standard internal combustion engines, whether operating on gasoline or diesel fuel, are air-breathing machines that rely on atmospheric oxygen for fuel oxidation. Atmospheric air normally contains approximately 20.95 percent oxygen by volume. The internal combustion process requires an oxygen concentration of at least 15 to 16 percent to support reliable spark ignition and compression ignition:

• Engine Stalling Mechanics: When a vehicle enters a dense carbon dioxide cloud, the heavy gas displaces ambient air, driving oxygen concentrations down to 10 percent or lower. The engine experiences immediate oxygen starvation. The air-fuel mixture becomes excessively rich, combustion ceases, and the engine stalls instantly.
• Loss of Power Assists: When the engine stalls while traveling down a roadway, power steering and power brake vacuum boosters cease functioning immediately. Steering effort increases significantly, and hydraulic brake pressure degrades after two or three pedal presses, creating immediate crash hazards on winding mountain roads.
• Restart Impossibility: Turning the vehicle ignition key or pressing the start button will merely crank the starter motor against dead cylinders. As long as the vehicle remains immersed in the oxygen-deficient gas cloud, no amount of cranking will restart the engine.
• Vehicle Passenger Compartment Infiltration: Standard automotive cabin ventilation systems, even when set to recirculation mode, are not hermetically sealed. Cold, heavy carbon dioxide rapidly infiltrates door seals, floorboard drain grommets, and heating ducts. Occupants who remain inside a stalled vehicle will lose consciousness within two to four minutes as gas concentrations inside the cabin equalize with the outdoor cloud.

The fundamental operational doctrine during an unprovoked vehicle stall near volcanic or limnic hazard areas is immediate egress. Abandon the vehicle instantly on foot, instruct all passengers to step out, and sprint uphill away from the roadbed.

Terrain Dynamics: Valleys, Saddles, and Micro-Topography¶

Bu mudi dioxide de carbone wenza mudimu bu bukole budi bukokela bintu panshi, micro-topographie wa muaba udibu basombele udi uleja muaba udi gaz mua kuikala, muaba udiye wenda, ne muaba udi miaba mimpe ya kusokomena.

Kujingulula ngikadilu wa buloba kudi kuambuluisha bantu badibu bumbushe bua kusungula njila lukasa mu tshikondo tshia dipatuka dia kapepe:

flowchart TD
    A["Dikuluka dia pa mutu pa dijiba didi dipatula luya lua bungi"] --> B["Gaz udi upueka mu misulu ne mu misulu ya musulu"]
    B --> C["Miaba idi yenza mudimu bu njila ya lufu mikole"]
    C --> D["Gaz udi uwuja miaba idi muinshi mua buloba ne nzubu ya muinshi mua buloba kumpala"]
    D --> E["Mikuna ya pa buloba ne mikuna mitumbuke idi yenza miaba ya tshisokomenu"]
    E --> F["Banda buludiludi mu tshibandabanda bua kufika ku kapepe kimpe"]

Buteyi bua mu musulu¶

Misulu ya mâyi, misulu miume, miaba ya misulu, ne misulu idi ileja muaba udi ne lufu lua bungi mu tshikondo tshia dibutuka dia limnic. Anu bu mudi mayi apueka mu tshibandabanda tshia hydraulique, ditutu dinene dia gaz didi dibuela mu misulu eyi, dienza musulu wa dioxide de carbone mukezuke. Luya lua gaz ludi lupita lubilu mu bibandabanda bikese bua tshienzedi tshia venturi, lufika too ne mu buondoke bua metre 10 too ne ku 30 (33 too ne ku 100 feet) munda mua tshina. Kulondi nansha kakese muinshi mua musulu anyi muinshi mua tshibandabanda paudi ukeba kunyema; misangu yonso ubanda mu tshina tshia mâyi mu njila muakane, ubanda ku bimanu bia ku luseke lua tshibandabanda.

Njiwu ya malu a njila¶

Njila minene ya ku mikuna ne ya mu misoko idi milongolola bilondeshile njila ya ku bufuki, ilonda mikuna, mikuna, ne misulu bua kukepesha njiwu ya njila. Nunku, njila ya mu bitupa bia maloba idi ilondangana buludiludi ne njila ya kumpala ya luya lukole lua gaz.

Mu bipupu bionso bibidi bia mu dijiba dia Monoun ne dia dijiba dia Nyos, bantu bavua bafue bakafua mu njila ivua ilonda muinshi mua mikuna. Shi udi mupeta bimanyinu bia gaz paudi wenda anyi wendesha, manya ne njila mulongolola udi ukulombola muaba udi njiwu mikole. Lekela pavema diakamue ne ubande pa mikuna idi pabuipi.

Miaba ya bukubi: Knolls, Spurs, ne Lateral Saddles¶

Micro-topographique mikese ya metre 15 too ne ku 30 (50 too ne ku 100 feet) pa mutu pa tshibandabanda idi mua kufila njila ya kusungila muoyo mu tshikondo tshia dipatuka dia gaz wa pa tshibidilu. Mukalu wa kuulu wa bukole budi bukokela bintu panshi, mumanyike bu tshitupa tshia gaz-air, udi ne bukole bua bungi. Kuimana pa tshibandabanda tshinene tshia mabue anyi pa tshibandabanda tshia ku luseke kudi kukuteka pa mutu pa tshibandabanda mu lupepele ludi kaluyi ne bukoya, nansha mudi tshibandabanda tshidi kuinshi tshishala tshikole.

Mudimu wa diumusha kapepe mu dijiba ne dipepeja dia kapepe¶

Panyima pa tshipupu tshia mu dijiba dia Nyos, bisumbu bia bena mudimu ba pa buloba bujima bia bamanyi ba malu a mikuna ya kapia, bamanyi ba malu a buloba ne ba-enjenyere ba nzubu bakalongolola mishindu mipiamipia ya dienza dia malu a buloba bua kujikija njiwu ya disangisha dia kapepe ne kupangisha dibutuka dia mabue a kapia mu matuku atshilualua.

Tshilumbu tshia kumpala tshia mudimu wa bu-enjenyere ntshia kuteka milonda ya kashidi idi idilama nkayayi, idibu babikila ne: auto-siphons:

• Mukenji wa mudimu: Mulonda wa polyethylene wa bujitu bua bungi, udi ne bule bua milimetre 150 too ne ku 200 (6 too ne ku 8 inches) mu diamètre, udi upuekeshibua mu tshitupa tshia muinshi menemene tshia dijiba tshidi ne gaz, tshienda tshifika kuinshi kua metre nkama ne nkama. Mutu wa tshiamu udi ujika pa tshibandilu tshidi tshienda pa mâyi pa mutu pa dijiba.
• Auto-Siphon Startup: Bua kutuadija diumusha dia gaz, pompe wa mashinyi udi pa tshibandilu tshidi tshienda pa mâyi udi ukoka mâyi manene mu tshitupa tshîpi kupitshila mu tshina. Padi mayi aa mapite bungi enda abanda, bukole bua hydrostatique budi bupueka, bienza bua bubble nucleation.
• Self-Sustaining Degassing Drive: Padi bipumbishi bienza, tshisambakaja tshia mayi ne kapepe tshidi munda mua tshibombi tshidi tshilua tshikese menemene kupita mayi a mu dijiba adi manyunguluke. Bukole bua bipese bia gaz bidi bienda bivula budi bufikisha tshipepele tshidi tshienda tshikola tshidi tshidilama nkayatshi. Mâyi a muinshi mua buloba adi abanda lubilu lukole mu tshina tshia mâyi kakuyi dijinga dia nzembu anyi dia tshiamu tshia pambelu, adi apueka bu tshina tshia mâyi ne gaz wa dioxide de carbone tshia bule bua metre 50 (164-foot) mu lupepele ludi pa mutu pa dijiba.
• Dijimina dia mu lupepele didi dilombodibua: Mushimi wa mâyi udi utungunuka udi upatula kapepe ka dioxide de carbone mu lupepele lua patoka mu bungi bukese budibu bakokesha budibu balengeja bimpe kudi lupepele lua pa mutu, bipangisha disangisha dia kapepe ka njiwu ka panshi eku bupuekesha ku kakese ku kakese bungi bua kapepe ka hypolimnion.

Milonda ya auto-siphon ivua miteka mu dijiba dia Nyos mu 2001 ne mu dijiba dia Monoun mu 2003, ivua mipatule bimpe menemene nkama ya miliyo ya metre cube ya gaz munyanguke ne mipuekeshe bikole njiwu ya diakamue ya dikuluka dia buloba. Ino, divuija dia kapepe ka magma didi ditungunuka muinshi mua dijiba, dilomba dilonda dia dîyi dia tshiendelele, dilongolola dia milonda, ne miaba ya kashidi ya dibenga kubuela mu dijiba.

Dilongolola dia dipatuka ne mikenji ya tshimpitshimpi¶

Mêku ne bena mutumba badi basombele mu bitupa bia kapia ka kapia pabuipi ne majiba adi ne mabue a nsongo badi ne bua kulama mikenji milongolola ya dilongolola dia malu a tshimpitshimpi bua kuambuluisha diandamuna dia lukasa ne dia dipangadika padi kapepe kapatuka.

Dilongolola dia nzubu kumpala kua tshibilu¶

• Dikonkonona dia njila wa buloba: Tangila buloba budi bunyunguluke nzubu webe, budimi buebe anyi muaba webe wa mudimu. Manya njila ya kumpala ne ya buibidi ya kunyema idi ifila buludiludi ku mutu kua mukuna too ne muaba mutumbuke kuyi upitshila mu misulu ya mâyi anyi mu misulu. Ujadike ne: bena mu dîku bonso mbamanye mukuna udibu ne bua kubanda.
• Biamu bia kupuya nabi mu tshimpitshimpi: Mu bitupa bidi ne njiwu mikole ya mikuna ya kapia, nzubu ne nzubu ya bungenda badi ne tshia kulama bintu bia kupuyakana nabi mu tshimpitshimpi (EEBA) anyi bibombi bia oxygène bia kumbula ne masque a mpala mujima adi ne bukole bua bungi. Umanye ne: bilamba bia kujika nabi lupuishi ne biamu bia kuela nabi lupuishi bia tshimpitshimpi kabiena bikuba muntu nansha umue ku dioxide de carbone to, bualu kabiena bifila oxygène to.
• Biamu bia kumanyisha nabi kapepe: Teka biamu bia kutangila nabi dioxide de carbone bidi ne bia kutemesha nabi bidi bilongolola bua kuenza mudimu ku 1,0 pa lukama (10 000 bitupa pa miliyo) ne 3,0 pa lukama (bitupa 30 000 pa miliyo). Vwala bintu ebi bikese pa mikaba anyi pa bintu bia mudimu paudi wenza mudimu mu miaba idi mikuna ya kapia mipuekele anyi pabuipi ne muelelu kua dijiba dia crater.
• Acoustic and Siren Networks: Kukuatshisha diteka dia biamu bia kutangila nabi dijiba bidi ne biamu bia kuteleja nabi dîyi bia mu mayi manene ne sirene idi yenza mudimu ne dîba idi ifila dimanyisha dia diakamue dia dipatuka dia bantu mu tshibandabanda tshijima padibu bamona dikuluka dia muinshi mua dijiba anyi dishintuluka dia lukasa dia bungi bua mâyi.

Dilondangana dia malu dia lukasa mu tshikondo tshia bualu kampanda¶

+----------------------------------------------------------------------------------------------------+
|                                 LIMNIC OVERTURN ACTION SEQUENCE                                    |
+----------------------------------------------------------------------------------------------------+
| STEP 1: Sensory Detection. Notice engine stalls, sour taste, breathless feeling, or white mist.   |
| STEP 2: Immediate Directional Call. Shout "GAS RELEASE: MOVE UPHILL" to family and neighbors.      |
| STEP 3: Perpendicular Ascent. Run immediately up the nearest hillside at right angles to valleys. |
| STEP 4: Gain Vertical Separation. Reach at least 30 to 50 meters above the valley floor.          |
| STEP 5: Conserve Physical Exertion. Stop once above the gas layer; sit quietly to reduce oxygen use|
| STEP 6: Maintain High Ground. Stay on ridges for at least 6 to 12 hours until winds disperse gas.  |
+----------------------------------------------------------------------------------------------------+

Dianyisha dia diambuluisha dia kumpala¶

Kupanduka ku dibutuka dia gaz limnic kudi kushiya bantu badi bakengeshibua ne disama dia dipanga dia mupuya, disama dia acidose systémique dikole, dinyanguka dia bitupa bia mubidi bidi kabiyi ne mashi, ne mputa mikuabu idi ifumina ku dikuluka dia tshimpitshimpi. Padi mishindu ya dituma dia baminganga mu tshimpitshimpi ne mashinyi a ambulanse a mu tshimenga kaayi mua kufika miaba idi bipupu bua mashinyi adi mamane ne njiwu idi mipuekele ya gaz, diambuluisha dia kumpala dia bantu badi pabuipi ne diambuluisha dia lukasa ne diambuluisha dia lukasa dia mu budimi bidi bileja ni babedi badi mua kupanduka.

Kujikija dilongesha dia diambuluisha dia kumpala, CPR, ne dia defibrillateur externe automatique ku diambuluisha dia bisumbu bimanyike, bu mudi: Croix-Rouge wa mu Amerike, Ambulance wa St. John, Croix-Rouge wa mu Canada, anyi bamfumu ba malu a bukubi bua bantu ba muaba udibu basombele, kudi kufila mamanya a luondapu adi mua kusungila muoyo. Dilongesha dia mudimu didi dikulongolola bua kupatula babedi mu miaba idi kayiyi ne kapepe kakuyi njiwu wewe nkayebe, kufila oxygène wa bungi ku diambuluisha dia biamu bidi kabiyi bia kupuyakana, kufila mupuya muimpe kudi bantu badi kabayi bapuyakana badi ne disama dia narcose wa dioxide de carbone, kulama bipupu ne bipupu bidi bifumina ku hypoxide cerebral, kufila diambuluisha dia luondapu too ne padi bisumbu bia bantu badi bumbusha bantu badi bafika.

Nkonko itubu bela misangu ya bungi¶

Miaba mifumina¶

• United States Geological Survey (USGS) Volcano Hazards Programme (United States): Modeling of Volcanic Gas Dispersion, Lake Nyos Scientific Studies, and Carbon Dioxide Health Hazard Assessments.
• Bulongolodi bua bukola bua mubidi pa buloba bujima (OMS): Mikenji ya malu a bukola bua mubidi idi itangila dioxide de carbone, mikalu ya dipeta dia bintu ku mudimu, ne mikenji ya tshimpitshimpi ya dijimija dia luya lua bungi.
• Tshibambalu tshia malu a mabue a mushinga mukole, mayi ne nzembu (Cameroun): Malu a mudimu wa diumusha kapepe mu dijiba dia Nyos ne dia Monoun ne mikanda ya dilongolola dia bipupu.
• Observatoire Volcanologique de Goma (OVG, Democratic Republic of the Congo): Dikonkonona dia tshitupa tshia kapepe ka mu dijiba dia Kivu, dikonkonona dia njiwu ya methane/CO2, ne dikonkonona dia kapia ka mu bitupa bia matunga.
• Tshisumbu tshia matunga masanga tshia malu a mikuna ya kapia ne a tshimuma tshia munda mua buloba (IAVCEI): Tshisumbu tshia malu a mikuna ya kapia (CVL) tshidi tshitangila malu a diumusha kapepe ne mikenji ya dipuekesha dia njiwu ya mâyi.
• Tshibambalu tshia malu a tshimpitshimpi tshia mbulamatadi (FEMA, États-Unis): Mikenji ya dipatuka dia gaz wa njiwu ne dibuela dia gaz muinshi mua buloba.

Malu adi apetangana¶

• Dikuba dia mikuna ya kapia, dikuluka dia lupuishi, ne diandamuna dia dibutuka dia kapia
• Dibutuka dia kapia ne matutu a dioxide de carbone a mu mikuna ya kapia
• Methane ne sulfure d'hydrogène bidi muinshi mua buloba bidi bibuela mu bukubi
• Mvula wa aside, vog, ne bukubi bua lupuishi lua kapia
• Dikuba dia muishi wa kapia ka muitu ne lupuishi
• Nomba ya njiwu bilondeshile ditunga