Wulkan laharlary (palçyk akymlary), piroklastiki dykyzlyk akymlary we agyr aşfal¶

Telewideniýäniň şekilleri wulkan atylmagy köplenç adamlaryň aňsatlyk bilen gidip bilýän haýal hereket edýän gyzyl lava akymlaryna, Amerikanyň Birleşen Ştatlarynyň Geologiýa Gözleg gullugy (USGS) we Halkara Wulkan Saglygy Howpsuzlyk Ulgamy (IVHHN) tarapyndan düzülen geologiki ölüm ýazgylaryna ünsi jemleýär, wulkan bilen baglanyşykly ölümleriň 90 göteriminden gowragy üç çalt ýa-da giň ýaýran howp sebäpli ýüze çykýar: ** piroklastiki dykyzlyk akymlary (piroklastiki akymlar) we galyndylar akýar) onlarça kilometr aşak düşýän binanyň üçeklerini ýykýan we mikroskopik wulkan aýnasy bilen howa ýollaryny bogýan ** agyr tefra we aşgar **.

Partlaýjy wulkan krizisinde diri galmak üçin ileri tutýan meseleleriňiz, piroklastiki akymlar ýa-da laharlar işe başlamazdan ozal resmi duýduryşlar bilen ** ewakuasiýa etmek, ** derýa jülgelerine perpendikulýar çykmak (jülgäniň diwarlaryny beýik ýere, hiç haçan jülgäniň aşagyna ýa-da ýokary akymyna çykmak) ** eger bir lahar size garşy gygyrsa, ýapyk penaňyzy möhürläň we ** F95, P2, külli däl tekiz ýa-da pes eňňitli üçegiň ýygnanmagyna ýakyndan gözegçilik ediň, şonuň üçin ** 10 santimetr (4 dýuým) çygly wulkan kül ** gurluşyň üstünden ýykylmanka ewakuasiýa edip bilersiňiz.

Indi et¶

1. ** Partlaýjy partlama duýduryşy berlende derrew gyzyl zolakly eňňitleri göçüriň: ** Resmi wulkan çykaryş zolagyndan çykmazdan ozal hiç wagt kül ýa-da lawany görmäge garaşmaň. ** Piroklastiki dykyzlyk akymlary ** wulkanyň kenarlaryndan sagatda 160-dan 700 kilometre çenli (sagatda 100-den 435 mil) ** 300-den 800 gradusa çenli (570-den 1470 gradus Farahheýt) ** temperaturada ylgaýar, pyýada ýa-da awtoulagda işe başlansoň mümkin däl.
2. ** Derýa jülgesinde bolsaňyz we çuňňur gykylyk ýa-da lahar sirenasyny eşitseňiz, derrew jülgäniň gyrasyna çykyň: ** Wulkan ** lahars (palçyk akymlary) ** wulkandan sagatda 30-dan 80 kilometre çenli (sagatda 20-den 50 kilometre çenli), hatda aç-açan bir günüň dowamynda ýagyş ýaganda ýa-da ýagyş ýaganda-da, bir günüň dowamynda ** 30-dan 80 kilometre çenli ýokarlanyp biler. Agyr sumkalary taşlaň we derýa kanalyna perpendikulýar ** dag gerşine, depä ýa-da kanýon diwaryna iň azyndan ** 20-30 metr (65-den 100 fut) ** çenli sürüň ýa-da sürüň. Lahar ýakynlaşanda hiç wagt köprüden geçmäň.
3. ** Öýkeniňizi we gözleriňizi derrew abraziw wulkan külünden goraň: ** Wulkan kül ýumşak agaç tüssesi däl; poslaýjy kükürt we gidroklor kislotasy bilen örtülen wulkan aýnasynyň mikroskopik şkaflary, kümüş kristal we mikroskopik şardlardyr. Çeňňek geýiň ** NIOSH N95, EN 149 FFP2 / FFP3, ýa-da P2 bölejikli respirator maskasy ** (ýa-da gyssagly ýagdaýda burnuňyza we agzyňyza çygly köp gatly pagta mata), derrew ** kontakt linzalaryny çykaryň we örtükli ýa-da ** howa geçiriji äýnek geýiň **.
4. ** Içerde boluň, HVAC we howa girişlerini ýapyň we agyr ýagyş wagtynda möhürleri möhürläň: ** windowshli penjireleri, gapylary, kamin damperlerini we şarjagazlary ýapyň we gulplaň. Öýüň içine daşarky howany çekýän ýa-da hereketlendirijilerini aýna çukurda ýakýan merkezi mejbury howa ýyladyşyny, peç janköýerlerini we penjire kondisionerlerini öçüriň.
5. ** Çygly nalyşlary diňläň we çygly kül 10 santimetrden (4 dýum) geçmänkä ewakuasiýa ediň: ** Gury wulkan külüniň agramy gardan 5-10 esse köp, ýagyş bilen çygly wulkan kül bolsa kub metr üçin ** 1500-2000 kilograma (kub fut üçin 93 - 125 funt) ** bolýar. Tekiz ýa-da giň gerimli üçegiň üstündäki kül çuňlugy ** 7.5-10 santimetr (3 to4 dýuým) ** ýakynlaşsa ýa-da içerki gapylar dykylsa, penjireler döwülse ýa-da potolok şöhleleri ýarylsa, üçek gowaklaryndan derrew binany göçüriň.
6. ** Derrew lahar ýa-da piroklastiki zonadan gaçmasaňyz, işjeň ýykylanda ulag sürmekden gaça duruň: ** Fallykylan kül günortan gara reňkli nol görünmegini döredýär, hereketlendirijiniň howa süzgüçlerini birnäçe minutda ýapýar (elektrik awtoulagyňyzy hemişelik saklaýar), elektrik alternatiwlerini gysgaldýar we ýollary çala, tormoz ýok ediji aýna pastasyna öwürýär.

flowchart TD
    Start["Partlaýjy wulkanyň atylmagy, Lahar Siren ýa-da agyr aşgazan duýduryşy"] --> ZoneCheck{"1. Häzirki wagtda haýsy wulkan howpy zolagy?"}
    ZoneCheck -->|Within 10 to 20 km of Crater / Pyroclastic Zone| EvacImmediate["Wulkandan derrew daşlaşyň: Piroklastiki akymlar sagatda 160-dan 700 km-e çenli 300-den 800 C çenli syýahat edýär"]
    ZoneCheck -->|In a River Valley Draining the Volcano (Up to 80 km Away)| LaharClimb["Lahar palçyk akymynyň howpy: Ilki Siren, ýer titremesi ýa-da çökmek, 20-30 m beýiklikdäki perpendikulýar ýokarky jülge diwarlaryna çykmak;"]
    ZoneCheck -->|Downwind Town or City Receiving Falling Ash (Tephra)| AshShelter["Agyr aşfal protokoly: Içerde hereket ediň, aragatnaşyk linzalaryny aýyryň, N95 / FFP2 maska ​​we äýnek dakyň"]
    AshShelter --> SealHouse["2."]
    SealHouse --> RoofCheck{"3. Kül ýygnamak 10 sm (4 inç) ýakynlaşýarmy ýa-da ýagyş üçekdäki kül bilen garyşýarmy?"}
    RoofCheck -->|Yes, or Roof Creaks / Doors Jam| RoofEvac["Roakynda üçegiň ýykylmagy: Gaty şlýapa / kaska, N95 we äýnek geýiň we dik ýa-da berkidilen gaçybatalga göçüriň"]
    RoofCheck -->|No: Under 5 cm (2 in) Dry Ash| SafeCleanup["Kül ýykylmagyny bes edýänçä garaşyň, süpürmezden ozal suw dumany bilen ýeňil çyglaň, külüň içine hiç wagt ýuwmaň."]

Üç sany wulkan howpuny deňeşdirmek: Piroklastiki akymlar, laharlar we kül¶

Her wulkan howpunyň fiziki özüni alyp barşyna, tizligine, temperaturasyna we ýetilişine düşünmek, wulkanyň kenarynda, aşaky derýa jülgesinde ýa-da 100 km aşakda ýerleşýän şäherde ýaşaýşyň taktikasynyň näme üçin düýpgöter tapawutlanýandygyny düşündirýär.

Pyroclastic density currents: why exclusion zones are non-negotiable¶

A pyroclastic density current (PDC) is the most lethal phenomenon in volcanology. It consists of two parts moving together at supersonic or near-supersonic speeds: a dense basal pyroclastic flow of boulders, pumice, and ash that hugs valley floors, and an overriding, turbulent, expanding cloud of superheated gas and fine ash called a pyroclastic surge that ignores topography, climbs uphill over mountain ridges, and can even skim across kilometers of ocean or lake water.

How pyroclastic currents form¶

1. Eruption column collapse (Fountain collapse): During an explosive eruption, when the volcano blasts out a mixture of rock and ash too dense for convective hot air to carry up into the stratosphere, the towering vertical column suddenly collapses back down under gravity and cascades down all sides of the mountain simultaneously.
2. Lava dome collapse (Merapi-type or Peléan flow): When thick, sticky, gas-rich magma oozes out of a summit vent to build a steep, unstable mound (lava dome), the side of the dome can crumble away without any warning explosion, unleashing a silent, incandescent pyroclastic avalanche down the slope.
3. Lateral blast: A landslide strips away the side of the volcano (as occurred at Mount St. Helens in the United States in 1980), uncorking a sideways-directed supersonic blast.

If caught near a volcano when a pyroclastic flow launches¶

Because pyroclastic flows kill within seconds through hyperacute thermal inhalation (breathing in a single gasp of 300-to-600-degree-Celsius gas and ash sears the trachea and larynx shut) and blast trauma:

• If you are in a vehicle on an open road with a visible black, boiling ground-hugging cloud racing down the mountain: Drive at maximum safe speed away from the volcano and perpendicular to any canyon channeling the cloud. Roll up all windows tightly, switch the car ventilation to Recirculate OFF / completely closed, and honk continuously to alert others.
• If escape is impossible and impact is seconds away (Last-Resort Ditching Protocol): Get inside the lowest, strongest subterranean reinforced concrete structure available (a deep underground cellar, concrete bunker, or windowless interior masonry room on the side of the building facing away from the volcano). Close all doors and windows, wet a thick towel or shirt immediately, clamp it tightly over your nose and mouth, pull clothing over all bare skin, and curl into a tight ball on the floor face-down to protect your airway during the 2-to-5-minute passage of the hot ash cloud.

Volcanic lahars: surviving high-speed concrete mudflows in river valleys¶

The Indonesian word lahar describes a rapidly flowing, gravity-driven mixture of volcanic rock debris and water that originates on the slopes of a volcano. People who have never seen a lahar often picture a muddy brown flood of water. In reality, a lahar has the consistency, weight, and physical power of wet concrete flowing at highway speeds.

Because a lahar contains up to 80 percent solid rock and sand by weight, its density is twice that of water. This extreme density creates buoyant forces so powerful that a lahar effortlessly picks up and floats multi-ton granite boulders, logging trucks, railroad locomotives, and entire steel highway bridges, using them like giant battering rams at the front of the flow to shear off every house, tree, and utility pole along the valley floor. Worse still, the moment a lahar slows down and spreads out across a flat town at the base of the valley, the water drains out of the slurry and the mud dewaters and solidifies like poured cement within minutes, trapping anyone caught waist-deep so tightly that they cannot be pulled free without heavy excavation machinery.

Three ways lahars start (Including years after the volcano goes quiet)¶

1. Snow and glacier melt during an eruption (Primary Lahar): When hot pyroclastic flows or lava erupt onto a snow-capped or glacier-covered volcano (such as Mount Rainier, Mount Hood, or Mount Baker in the United States; Nevado del Ruiz in Colombia; Cotopaxi in Ecuador; or Mount Ruapehu in New Zealand), millions of cubic meters of ice melt instantaneously and rush down every glacial river valley radiating from the peak.
2. Crater lake breach: An explosion cracks the rim of an acidic summit crater lake, dumping an entire lake down the canyon.
3. Post-eruption rain-triggered lahars (Secondary Lahars): For months to several years after a major ash eruption, the upper slopes of the volcano lie buried under meters of loose, hydrophobic ash that killed all vegetation. Whenever a normal heavy rainstorm or tropical typhoon hits the mountain, rainwater cannot soak into the crusted ash; instead, it sheets off the slopes, mixes with the loose tephra, and launches violent rain-triggered lahars down the rivers on days when the volcano itself is completely quiet.

Immediate field rules for surviving a lahar¶

• Recognize the acoustic and visual warning signs:
• Official Acoustic Flow Monitor (AFM) lahar sirens (which sound a continuous wailing tone or voice alert across high-risk valleys like the Puyallup Valley below Mount Rainier) or emergency mobile broadcast alerts.
• A deep, continuous, freight-train or jet-engine ground rumble and vibration coming from upstream that grows louder every second (unlike an earthquake, which peaks and fades within a minute, a lahar rumble builds steadily as the boulder front approaches).
• The river level suddenly dropping or drying up (caused by an upstream landslide temporarily damming the gorge) OR the river suddenly turning thick, steaming, muddy gray-brown with floating trees and a pungent smell of sulfur.
• Climb UP, never try to outrun a lahar down the valley:
• If you are on foot or in a jammed traffic line on a valley floor, turn 90 degrees away from the river and go straight up the nearest valley wall, hillside, bluff, or designated evacuation mound.
• Gaining just 20 to 30 meters (65 to 100 feet) of vertical elevation above the river channel puts you completely above the reach of almost all lahars.
• Never cross a bridge when a lahar is coming or visible upstream: Lahars routinely tear bridges off their concrete piers or pile giant logjams against bridge decks, sweeping the entire bridge and every car on it away in seconds.
• Never walk onto a freshly deposited lahar crust: Even after a lahar stops moving, a dry-looking gray crust forms on top within hours while the interior underneath remains bottomless, sometimes boiling-hot quicksand for days or weeks. Waiting until civil engineers test the bearing capacity prevents fatal sinking and scalding burns.

Heavy volcanic ashfall (Tephra): roof collapse physics and structural survival¶

Unlike wood ash from a campfire or wildfire (which is soft, feathery organic carbon that dissolves in water and blows away in a breeze), volcanic ash consists of jagged, pulverized rock crystals and sharp microscopic shards of silica glass (\(SiO_2\)) blasted apart by expanding magma gas.

Why volcanic ash collapses roofs far faster than snow¶

Building codes in cold climates design residential roofs to support snow, which is mostly trapped air and weighs only 100 to 200 kilograms per cubic meter (6 to 12.5 pounds per cubic foot). Volcanic ash is solid pulverized rock:

Critical roof collapse warning signs and safe ash-clearing rules¶

1. Monitor ash depth and structural stress signs indoors:
2. Measure ash accumulation on a flat, wind-sheltered surface outside a window. Once ash reaches 5 to 7.5 centimeters (2 to 3 inches) on a flat or low-pitched roof (or if rain begins falling on existing ash), prepare to evacuate or clear the roof only if safe.
3. Immediate evacuation signs: If you hear loud popping, cracking, or groaning sounds from the attic or ceiling, see plaster or drywall flaking off ceiling joints, notice sagging ceiling panels, or find that interior bedroom or closet doors suddenly jam and will not open or close (meaning the weight of the roof is bowing the load-bearing walls downward), do not go onto the roof, put on hard hats/helmets, N95 masks, and goggles, and evacuate everyone out of the house immediately to a steep-pitched A-frame building, reinforced concrete lower floor, or vehicle parked in the open away from trees and power lines.
4. Roof-fall deaths during cleanup: Post-eruption medical studies (such as after the 1991 Mount Pinatubo and 2014 Kelud eruptions) show that more people die or suffer paralyzing spinal fractures from slipping off ash-slick roofs during cleanup than from roofs collapsing on them indoors. Volcanic ash on metal, tile, or shingle roofs acts like millions of microscopic ball bearings, and turns into a slick grease when damp.
5. If you must clear a low, strong roof to save it:
6. Never go onto a roof during active ashfall (visibility is zero, lightning strikes regularly inside volcanic ash plumes, and falling rocks/lapilli cause skull fractures) and never go onto a roof that is already creaking or sagging.
7. Use a long-handled roof rake or push broom while standing safely on the ground or a stabilized ladder to pull ash off the lower eaves first.
8. If stepping onto a low-slope roof is unavoidable, wear a safety harness anchored with a climbing rope to a solid tree or vehicle on the opposite side of the house, wear an N95/FFP2 respirator and sealed goggles, and shovel ash off systematically from the peak downward in even strips so you do not overload one half of the roof truss.
9. Disconnect downspouts from rainwater cisterns and French drains immediately: Stuff a rag into the top of gutter downspouts or saw/disconnect the bottom of the downspout pipe before sweeping ash off the roof; if volcanic ash washes into underground stormwater pipes or septic drainfields, it sets like concrete and permanently ruins the entire plumbing system.

Protecting lungs, eyes, and drinking water from volcanic ash and acid gases¶

Freshly fallen volcanic ash particles are frequently smaller than 10 micrometers (\(PM_{10}\)) and 2.5 micrometers (\(PM_{2.5}\)), allowing them to penetrate deep into the terminal bronchioles and alveoli of the lungs, while their fresh glassy surfaces carry condensed droplets of sulfuric acid (\(H_2SO_4\)), hydrochloric acid (\(HCl\)), and hydrofluoric acid (\(HF\)).

1. Respiratory protection (Asthma, COPD, and crystalline silica)¶

• Always wear a rated particulate respirator outdoors or when sweeping ash: Standard surgical ear-loop masks leave wide gaps at the cheeks that let fine volcanic glass right into your airways. Use a NIOSH-approved N95, N99, or P100 mask (United States), an EN 149 FFP2 or FFP3 mask (Europe/UK), or a P2 mask (Australia/New Zealand), pinching the metal nose bridge tightly and using both head straps.
• Emergency improvised mask if no N95 is available: Fold a thick cotton T-shirt, bandana, or dish towel into 4 to 8 layers, dampen it lightly with clean water (not soaking wet, which blocks breathing, just damp enough that fine ash particles stick to the wet fibers and water neutralizes soluble acid gases like sulfur dioxide), and tie it snugly over your nose and mouth.
• High-risk asthma and bronchitis flares: Even people with mild childhood demgysma who have not needed an inhaler in years routinely suffer severe acute bronchospasm within minutes of breathing volcanic ash or sulfur dioxide (\(SO_2\)) gas. Keep rescue inhalers (albuterol/salbutamol) in your pocket at all times and stay strictly inside a sealed room until ash settles.

2. Eye protection: why contact lenses cause severe corneal abrasions¶

Never wear contact lenses during or for several days after volcanic ashfall. Microscopic shards of volcanic glass slip underneath soft or rigid contact lenses; every time you blink, the contact lens grinds those glass shards across the cornea like sandpaper, causing deep, painful corneal abrasions and chemical acid burns.

• Switch to eyeglasses and wear non-vented goggles outdoors: Ski goggles, swim goggles, or sealed industrial safety goggles keep blowing ash out of the eyes.
• ** Wulkan kül gözüňize girýän bolsa: ** ** Gözüňizi sürtmäň. ** Bir tabaga ýa-da suwa çümüp barýarkaňyz çalt gözüňizi ýumuň, ýokarky kirpigi aşaky kirpikleriň üstünden ýuwaşlyk bilen çekiň we açyk gözüňizi steril duzly kirpik ýa-da içki burçdan (burun köprüsiniň golaýy) arassalanan çüýşeli suw bilen yzygiderli ýuwuň.

3. Içimlik suwy, mallary we elektrik torlaryny goramak¶

• ** Içýän suw we gidroflor kislotasy ($ HF $) zäherliligi: ** Partlama başlanda derrew ýagyş suw çüýşelerinden üçek tutýan çukurlary aýryň. Şäher häkimliginiň suw howdanlarynda orta kül esasan bulutlylyga (bulaşyklyga) we suw arassalaýjy desgalaryň süzüp bilýän biraz kislotaly tagamyna sebäp bolsa-da, ftor baý wulkanlardan (meselem, Islandiýa, Täze Zelandiýa ýa-da Günorta Amerika) zäherli ** florid ** açyk suw çukurlaryna we howuzlara (** floroz **) çalt zäherläp bilýär. Hemmesini saklaň öý haýwanlary örtülen saklanylýan iýmitde we arassa kran / çüýşeli suwda mallar.
• ** Elektrik torlaryna çygly kül "ýalpyldawuk" öçürilýär: ** Gury wulkan kül elektrik izolýatorydyr, ýöne ýeňil ýagyş, duman ýa-da daň şygyry peýdaly polýuslarda we transformatorlarda ýokary woltly keramiki izolýatorlary çygly kül güýçli elektrik geçirijisine öwürýär. Çygly külüň üstünden ýokary woltly elektrik ýaýlary (** izolýator flashover **), transformatorlary üfledi we tutuş şäherleri uzaga çekdi elektrik togunyň kesilmegi just when water pumps are needed most. Fill bathtubs, pots, and water jugs with clean tap water as soon as you hear an eruption has occurred, before the ash cloud reaches your town and knocks out the power grid.

Safe post-eruption ash cleanup and vehicle protection rules¶

Once ashfall stops, cleanup requires patience and strict dust suppression so you do not aerosolize the settled glass shards back into your lungs:

• ** Süpürmezden ozal suw bilen ýumşak duman: ** Wulkan külüne hiç haçan gury süpüriň ýa-da ýaprak üflemäň; ýaprak üfleýjileri kör, öýkenine zyýan berýän kremniniň bulutlaryny döredýär. Külüň ýüzüni ýeňil nemlendirmek üçin bag şlangynyň ujuny ýa-da pürküji çüýşäni ulanyň, ony agyr plastik paketlere atyň (her halta bary-ýogy ** ýarym dolulygyna dolduryň, sebäbi wulkan külüniň doly hapa sumkasy 40-60 kilograma / 90-130 funt bolup, arkaňyzy açar ýa-da ýaralar).
• ** Wulkan külüni öý lýubkalarynda, hajathanalarda ýa-da köçe tupan zeýkeşlerinde ýuwmaň: ** Kül turba duzaklarynda we şäher kanalizasiýa kanallarynda ýerleşýär we betona gaty bolýar.
• Clean household appliances with a vacuum HEPA filter or compressed air, never wipe dry glass with a cloth: Wiping dry ash off car windshields, eyeglasses, solar panels, or camera lenses with a rag or dry windshield wipers grinds permanent scratches into the glass. Rinse generously with a hose first, or blot gently with wet sponges.
• ** Kül bilen sürmeli bolsaňyz: ** Dwigateliň howa süzgüçini we kabinanyň howa süzgüçini derrew çalyşyň, motoryň ýagyny we ýag süzgüçini üýtgediň we adaty sürmezden ozal tormoz torlaryny, rotorlary we alternatiw jaýlary mehaniki basyş bilen ýuwuň.

Freygy-ýygydan berilýän soraglar¶

Çeşmeler barlandy¶

• United States Geological Survey (USGS) Volcano Hazards Program: Living with Volcanic Risk: Lahars, Pyroclastic Flows, and Volcanic Ash (Tephra) Roof Load and Cleanup Guidelines.
• International Volcanic Health Hazard Network (IVHHN), World Health Organization (WHO), and Cities and Volcanoes Commission: The Health Hazards of Volcanic Ash: A Guide for the Public and Guidelines on Preparedness Before, During, and After an Ashfall.
• ** Adatdan daşary ýagdaýlary dolandyrmak boýunça federal agentlik (FEMA) we Ready.gov (ABŞ): ** * Wulkana taýynlyk, Laharlar üçin dik ewakuasiýa we gurluş gar / kül ýük howpsuzlygy *.
• ** GNS Science (Te Pū Ao) we Milli Adatdan daşary ýagdaýlar boýunça dolandyryş gullugy (NEMA, Täze Zelandiýa): ** * Wulkanyň ýykylmagy möhüm infrastruktura, üçegiň ýykylmagy we oba hojalygynyň suw howpsuzlygy *.
• ** Gyzyl Haç we Gyzyl esarymaý Jemgyýetleriniň Halkara Federasiýasy (IFRC, International): ** * Partlaýjy wulkanyň atylmagy we Lahar ewakuasiýasy üçin betbagtçylyklara garşy teswirnamalar *.

Degişli gollanmalar¶

• Wulkanlar we wulkan atylmagyna taýýarlyk
• Limnik atylmalary we wulkan kömürturşy gazy bulutlary
• Göz daşary ýurt jisimi, korne aşgazany we kebşirleýji fleş ilkinji kömegi
• Astma ilkinji kömegi we inhaler spacer halas edişini amala aşyrýar
• Structural damage and building collapse safety
• Countryurt boýunça gyssagly kömek belgileri