Meteor Airbursts, Industrial Shockwaves, ani Blast Overpressure Glass Faratiw¶

When a house-sized meteoroid (bolide) explodes in the upper atmosphere or a massive industrial facility, munitions depot, chemical refinery, or grain silo detonates several kilometers away, a deadly physics trap catches almost every bystander off guard: the massive gap between the speed of light and the speed of sound. Light from the blinding atmospheric fireball or rising mushroom cloud travels at 300,000 kilometers per second (186,000 miles per second), reaching your eyes instantaneously. By contrast, the destructive supersonic acoustic shockwave (blast overpressure wave) travels through the air at roughly the speed of sound, 340 meters per second (1,115 feet per second, or about 1 kilometer every 3 seconds / 1 mile every 5 seconds).

O waati kɔnɔna na, segin 10 fo 150 kɔnɔna na, sankolo yeelenba dɔ kɔfɛ walima tasumabɔlan yɔrɔjan dɔ kɔfɛ, hadamadenw ka ɲininikɛcogo bɛ mɔgɔ miliyɔn caman wajibiya u ka taama ka taa ja finɛtiri belebelebaw la, biro ɲɛfɛ minnu bɛ gilasi la, ani lakɔli kalanso finɛtiriw la, walasa ka kɛnɛma filɛ sisi sira kan. Seginnkanni damadɔ o kɔfɛ, degunba min tɛ ye, o bɛ wuli ka don boon kɔnɔ, ka mɛtɛrɛ kɛrɛnkɛrɛnnen ba caman kɛ plati galasi ye ka kɛ sanbɛlɛ ye min bɛ mɔgɔ faga, n’o ye sanbɛlɛ ye min bɛ se ka kɛ i n’a fɔ razɔri, n’u bɛ pan so kɔnɔ ni mɛtɛrɛ 30 fo 60 ye segin kɔnɔ (65 fo 135 mph). Tariku kunnafoniw minnu bɔra mɛtɛrɛw fiɲɛbɔbaw la ani izini kurunbonkarila binkanniw na, olu b’a jira ko siwiliw bɛɛ jogin kɛmɛsarada la, 80 fo 90 ni kɔ bɛ sɔrɔ finɛtiri galasi pantɔw fɛ ka mɔgɔw gosi minnu taamana ka taa finɛtiri la, flash yelen kɔfɛ. Ni aw ye o yɔrɔnin bɛɛ sariya dɔn, "Aw ye fiyentɔya fiyentɔya walima sisi kulu dɔ lajɛ: aw bɛ aw yɛrɛ tanga finɛtiriw ma joona", o bɛ aw ɲɛw, joli siraw ani aw ka ɲɛnamaya tanga.

Aw bɛ o kɛ sisan¶

1. I ka i yɔrɔ janya finɛtiriw bɛɛ la, gilasi da la, sanfɛlanw bɛɛ la, ani filɛlikɛlanw bɛɛ la, ni i ye sankolo yeelen fiyentɔ ye, tile tasuma sira, walima binkannikɛlan yɔrɔjan. Aw kana taama abada ka taa finɛtiri fan fɛ walasa ka yeelen jɛlen walima sisi jɔlan lajɛ. I bɛ yɔrɔ o yɔrɔ sɔrɔ k’a ta seginkanni 3 la ka se miniti 2,5 ma sanni mankanba yebali ka se ka boon finɛtiri bɛɛ fiyɛ ni fanga ye ka don kɔnɔna na.
2. Aw bɛ jigin duguma kɔnɔna na, jirisunba dɔ kɔnɔ, walima minɛn barikama kɔfɛ ka aw kunkolo ni aw ɲɛw datugu. Aw bɛ aw da duguma walima ka aw biri duguma ni aw kɔ ye ka taa gilasi tɔ bɛɛ la, ka aw kunkolo ni aw kɔ kɔfɛla tanga ni aw bolokɔniw ye, ka aw ɲɛw datugu kosɛbɛ walasa galasi buguri min bɛ fiɲɛ fɛ, o kana se ka aw ɲɛdawolo tigɛ.
3. Open your mouth slightly and do not plug your ears with rigid objects if a close-range blast wave is imminent. Equalizing air pressure across both sides of your eardrum (tympanic membrane) through your Eustachian tubes reduces the risk of eardrum rupture when the sudden atmospheric pressure spike hits; cover your outer ears with your cupped palms while keeping your jaw slightly relaxed.
4. Stay away from weak warehouse roofs, brick facades, and suspended ceilings after the first loud boom. Both meteor airbursts and industrial plant explosions generate multiple shockwaves (either from fragmenting meteor pieces hitting their terminal burst points in sequence, or when a smaller primary warehouse fire detonates a massive secondary ammonium nitrate or fuel-air tank 30 to 120 seconds later).
5. Put on hard-soled shoes before taking a single step after the shockwave passes, and check for arterial bleeding. After a blast wave shatters windows, every floor is carpeted in invisible glass needles. Control any spurting neck or limb lacerations immediately with firm direct pressure or a tourniquet (see joli bɔli dɛmɛ fɔlɔ), and never rub an eye that has glass dust in it.
6. Check for gas leaks, move upwind if a chemical plume is visible, and avoid tying up cellular voice networks unless you have a life-threatening emergency. Only call your local emergency number (911 in the United States and Canada, 112 across the European Union, 999 in the United Kingdom; see kɔrɔtɔko nimɔrɔw) for severe trauma, trapped victims, or active fires, and use SMS text messaging to check on family members so emergency dispatch channels do not collapse.

The physics of airbursts, shockwaves, and light-to-sound delay times¶

Whether an explosion occurs 25 kilometers (15.5 miles) straight up in the stratosphere from a hypersonic asteroid or at ground level 5 kilometers (3.1 miles) away at a chemical refinery or fuel depot, the injury mechanism inside homes, schools, and offices is governed by blast overpressure and acoustic propagation speed.

flowchart TD
    A["Blinding Flash in Sky, Vapor Trail, OR Distant Explosion Plume"] --> B["IMMEDIATE ACTION: Do NOT walk to window; shout 'GET AWAY FROM GLASS'"]
    B --> C["Move to Interior Hallway / Room within 3 Seconds"]
    C --> D["Drop Low, Face Away from Glass, Cover Head/Neck, Open Mouth Slightly"]
    D --> E["PRIMARY SHOCKWAVE HITS: Windows shatter; building shakes; loud sonic boom"]
    E --> F["Wait 2 to 3 Minutes in Cover for Secondary Shockwaves / Falling Glass"]
    F --> G{"What was the source of the shockwave?"}
    G -->|"Meteor / Bolide Airburst in Upper Sky"| H["Put on shoes; treat glass cuts; check gas heaters/flues knocked loose by pressure wave"]
    G -->|"Ground-Level Industrial / Chemical / Port Explosion"| I["Check wind direction; evacuate crosswind/upwind or shelter-in-place if toxic smoke plume approaches"]

How a meteor (bolide / superbolide) airburst generates a city-wide shockwave¶

Every day, small meteoroids burn up harmlessly as shooting stars 80 to 100 kilometers (50 to 62 miles) above the Earth. However, when a stony or iron asteroid fragment measuring 5 to 30 meters (16 to 100 feet) across enters Earth's atmosphere at hypersonic velocities of 15 to 40 kilometers per second (33,500 to 90,000 mph, or Mach 45 to Mach 120):

1. Extreme ram pressure and radiant fireball: As the meteoroid plunges down into the denser atmosphere between 45 and 20 kilometers (28 to 12 miles) altitude, the air in front of it cannot get out of the way fast enough. The compressed air heats into an incandescent plasma fireball hotter than the surface of the sun, temporarily shining brighter than the midday sun across a 100-kilometer (62-mile) radius and capable of causing mild ultraviolet flash sunburns and temporary flash blindness to anyone staring straight at it.
2. Mechanical pancaking and catastrophic airburst: When the stagnation ram pressure on the nose of the asteroid exceeds the compressive structural strength of the rock (typically 1 to 10 megapascals at an altitude of 20 to 30 kilometers / 12 to 19 miles), the asteroid fractures, flattens like a pancake, and vaporizes in a runaway atmospheric airburst releasing energy equivalent to hundreds of kilotons of TNT.
3. Cylindrical line-source shockwave: Because the meteor is moving at Mach 50+ along a shallow trajectory while exploding, its cylindrical Mach cone merges with the terminal explosion wave to send a massive hemispherical shockwave crashing downward toward the ground. Because the burst happens 20 to 30 kilometers (12 to 19 miles) straight overhead, it takes 60 to 150 seconds for that shockwave to travel down through the atmosphere and slam into cities below.

Calculating your countdown window: flash-to-bang time table¶

Because light arrives in less than a millisecond while the shockwave travels at roughly 340 meters per second (0.34 kilometers per second, or 1 mile every 4.8 seconds) in standard air (slightly faster right near the blast source where the wave is supersonic), the distance to the explosion dictates how many seconds you have to get every person away from glass:

Fɔɲɔba degunba bɛ finɛtiriw tiɲɛ cogo min na sira fila fɛ (fasa ɲuman ni fasa jugu) .¶

Blast shockwave tɛ fiɲɛ gɛrɛgɛrɛ kelen ye; a bɛ kɛ ni degun dakun fila ye minnu tɛ kelen ye, minnu b’a ɲɛfɔ mun na gilasi bɛ bin so kɔnɔ ani kɛnɛma nbɛdaw la:

1. The Positive Overpressure Phase (Inward blast): Shockwave ɲɛfɛla ye fiɲɛ minɛlen kogo ye min ka fin i n’a fɔ razɔri, degun bɛ wuli yɔrɔnin kelen ka tɛmɛ fiɲɛ tansiyɔn normal kan. Hali ni a bɛ iko degunba min ka dɔgɔn, n’o ye kilopascal 1,5 fo 3,5 ye (kilo 0,2 fo 0,5 insitiri kɛrɛnkɛrɛnnen kelen na / psi) o bɛ kilo 150 fo 350 kɛ ka mɛtɛrɛ kɛrɛnkɛrɛnnen kelen kɛ (kilo 30 fo 70 ye mɛtɛrɛ kɛrɛnkɛrɛnnen kelen na) ka ɲɛsin soba walima biro finɛtiriba ma. Glass float Annealed bɛ biri ka don kɔnɔna na ka tɛmɛ a kariyɔrɔ kan, ka pɛrɛn ka tɛmɛ so kɔnɔ i n’a fɔ bɔgɔdaga min bɛ kɛ ni daggerw ye minnu bɛ pan.
2. The Negative Underpressure / Suction Phase (Outward pull): O yɔrɔnin bɛɛ, tansiyɔnba jikuru ɲɛfɛla bɛ tugu fɛn dɔ la min bɛ wele ko vacuum trough yɔrɔ min na fiɲɛ tansiyɔn bɛ jigin ka tɛmɛ fiɲɛ tansiyɔn nɔgɔman kan fo segin tannan caman. Fiɲɛ min sirilen bɛ sow kɔnɔ, o bɛ barika sɔrɔ ka taa kɛnɛma ka don nbɛda la min ka tansiyɔn ka dɔgɔ, ka finɛtiriw, ridow ani fiyentɔw karilenw tolenw tigɛ kɛnɛma siraba kan minnu bɛ duguma. O de y’a to ka jɔ dugu siraba kan, biro boon dɔ jukɔrɔ min dilalen don ni rido ye min dilalen don ni galasi ye, flash kɔfɛ, o farati ka bon i n’a fɔ ka jɔ finɛtiri ɲɛfɛ so kɔnɔ.

Jaabi min bɛ kɛ senfɛ-senfɛ, shockwave jatebɔ waati la¶

N’i ​​ye yeelen fiyentɔ dɔ ye min ɲɛfɔlen tɛ, min bɛ sankolo yeelen walima ka biɲɛba barikamaw bɔ tile yeelenba la, walima n’i ye tasumamugu belebeleba dɔ ye min ɲɛ ye fin ni oranjɛ ye walima ɲɛgɛn koloma min bɛ ka wuli ka bɔ izini mara dɔ la:

1. So, lakɔli, biro walima magan kɔnɔ¶

• I ka cikan jɛlen, kɛrɛnkɛrɛnnen dɔ pɛrɛn joona: Kule "Shockwave coming, get away from the windows NOW." Mɔgɔ fanba bɛ nɛnɛ walima ka taama ka taa finɛtiriw fan fɛ bawo u t’a dɔn ko shockwave bɛ tugu flash jɛlen dɔ kɔ.
• Aw bɛ so minnu kɔnɔ, galasi walima sanfɛlanw bɛ minnu na, aw bɛ olu bɔ yen joona: Aw bɛ teliya ka bɔ kɛnɛma yɔrɔw la, tilebɔyɔrɔw la, seriw kɔnɔ, farikoloɲɛnajɛyɔrɔw la minnu sanfɛla ye galasi ye, ani lamini birow minnu finɛtiriw bɛ duguma ka taa sanfɛ.
• Aw bɛ kɔnɔna da gɛlɛn walima kogo tilayɔrɔ dɔ bila aw ni kɛnɛma finɛtiriw cɛ: Aw bɛ taa cɛmancɛ la finɛtiri tɛ min na, kɔnɔna sanuyaso (aw bɛ aw janto kogo filɛlikɛlanw na), finidoncogo, walima bɛton ɛrɛzɛnsun na, ani aw bɛ kɔnɔna jirida sama ka tugu aw ​​kɔfɛ. Kɔnɔna jirida gansan min kɔnɔna bɛ dingɛ kɔnɔ walima min kɔnɔna ka gɛlɛn, o bɛ finɛtiriw tigɛli kɛmɛsarada la 100 jɔ ka bɔ kɛnɛma so kɔnɔ.
• Aw bɛ fiɲɛbɔcogo ta: Aw bɛ jigin ka se aw gɛnɛgɛnɛw ma walima ka aw da aw kɔnɔbara kan ni aw senw ɲɛsinnen bɛ kɛnɛma kogo ma ani ka aw kunkolo ɲɛsin galasi si ma. Aw bɛ aw bolokɔniw tigɛ aw kɔ kɔfɛ, ka aw dawolo siri aw disi la, ka aw ɲɛw datugu, ka aw da wuli dɔɔni.

2. Kɛnɛma dugu sira kan walima yɔrɔ dafalen dɔ la¶

• Aw bɛ bɔ sanfɛlanw ni kabakurunw jukɔrɔ minnu dilalen don ni galasi ye: N’i bɛ taama dugu cɛmancɛ siraba kan ni sankolo yeelen walima izini yɔrɔjan fiyɛli kɛra, degun ɲuman ni jugumanba bɛna gilasi karilen kilo ba caman jigin ka bɔ sankanso 10 na ka se sankanso 40 ma sanfɛ fo ka se segin 60 ma boom kɔfɛ.
• Aw kana boli ka don kɔnɔna na ka tɛmɛn soba da belebele dɔ fɛ min dilalen don ni galasi ye: O nɔ na, ​​aw bɛ sen don boon sanfɛla dɔ jukɔrɔ min kɔnɔna bɛ don ni bɛton barikama ye, ka don dugujukɔrɔ metoro da la, min kɔnɔna na, galasi sanfɛla tɛ min na, walima aw bɛ taa parki binkɛnɛ da wulilenba dɔ cɛmancɛ la walima bolifɛnw jɔyɔrɔba dɔ cɛmancɛ la, min yɔrɔ ka jan boon ɲɛfɛla la ani sanfɛla la, ka aw kun datugu.

3. Ni aw bɛ mobili boli¶

• I kana freinw sɔgɔ siraba cɛmancɛ la ni sankolo bɛ manamana walima ni sonic boom bɛ i ka mobili lamaga: Ni sɔgɔsɔgɔninjɛ bɛ mobili lamagatɔ gosi, o bɛ kɛ i n’a fɔ pankurun naani bɛɛ bɛ fiyɛ waati kelen na walima i kɛrɛfɛ mobili bɛ i ka da kɛrɛ fɛ.
• Aw bɛ taamasiyɛn kɛ ani ka a sama ka taa sira kɛrɛ fɛ ka ɲɛ ka bɔ galasi sow la, siraba kan tɛmɛsira minnu taamasiyɛnw bɛ lafiya, ani nafamafɛnw. Aw bɛ aw ka sigilan sirilen to ani ka aw ɲɛsin duguma dɔɔnin ka taa dasibɔlan fan fɛ ni jikuru bɛ ​​tɛmɛ ni kɛrɛfɛ finɛtiri galasi ye fɛn tiɲɛ. (Bi mobili kɛrɛfɛ finɛtiriw dilannen don ni lakana galasi ye min bɛ sɔgɔsɔgɔ ani fiɲɛbɔlanw dilannen don ni polivinili butirili galasi lamininen ye, o b’a to mobili kɔnɔna bɛ lakana kosɛbɛ ka bɔ sɔgɔsɔgɔninjɛ la ka tɛmɛ ka jɔ du finɛtiri kɛrɛfɛ min bɛ sɔgɔ.)

Dɛmɛ fɔlɔ minnu bɛ kɛ ka ɲɛsin fiɲɛbɔli degunba ma ani gilasi karilen joginw ma¶

Ni sɔgɔsɔgɔninjɛ fɔlɔ ni binkanni filanan o binkanni filanan tɛmɛna, aw bɛ aw janto mɔgɔ fagalenw na ni joginda fɔlɔw ye minnu bɛ bɛn fiɲɛbɔ ni galasi fɛɛrɛw ma:

Post-shockwave building hazards: gas flues, hanging glass, and toxic plumes¶

After the boom fades, two major secondary emergencies threaten survivors depending on whether the shockwave came from an atmospheric meteor airburst or an industrial ground explosion:

1. Carbon monoxide and natural gas hazards after a pressure wave¶

When a shockwave sweeps across a city (especially during winter, as occurred in Chelyabinsk at minus 15°C / 5°F), the sudden positive-and-negative air pressure spike pushes down every chimney and roof vent on tens of thousands of homes simultaneously:

• Disconnected furnace and water-heater exhaust flues: The pressure pulse down the chimney routinely blows sheet-metal exhaust flue pipes right off the tops of natural-gas water heaters and home furnaces, or collapses brick chimney liners inside walls. If the furnace keeps running while the windows are boarded up with plywood against the winter cold, odorless carbon monoxide (CO) floods the house; see gazi monoksidi baga bɛ mɔgɔ la.
• Inspect every gas appliance vent pipe immediately after a shockwave: Check the sheet-metal draft hood and exhaust pipe on your water heater and furnace before running heat, and smell for rotten-egg mercaptan gas leaks at your meter; see gas leak what to do.

2. Ka "guilotine" sɔgɔlenw bɔ finɛtiriw la¶

Do not allow family members or coworkers to walk beneath shattered window frames to sweep the floor until the upper frame has been checked. Annealed single-pane and double-pane windows leave heavy, jagged triangular daggers of glass hanging loosely in the top sash channel that drop like a guillotine when a door slams or an aftershock vibrates the wall. Wear heavy leather gauntlet gloves, hard-soled boots, and safety goggles, and tap remaining loose upper shards down into a heavy cardboard box or onto a thick tarp using a long broom handle from the side before anyone walks near the sill; see broken window emergency repair.

3. Industrial chemical plumes vs. harmless meteor dust¶

• Ni sɔgɔsɔgɔninjɛ bɔra mɛtɛrɛ fiɲɛbɔlan dɔ la min bɛ sanfɛyɔrɔba la: Sankaba finman min bɛ to ka jɛngɛ kilomɛtɛrɛ 20 fo 40 (milimɛtɛrɛ 12 fo 25) sanfɛ stratosphère kɔnɔ, o bɛ kɛ ni silikati fara labɔlen ye, nɛgɛ-nikɛri ɔkisizɛni, ani jikuruw a bɛ baga zeru lase mɔgɔw ma minnu bɛ dugukolo kan. (Ni aw ye kabakurun misɛnnin nɛrɛma, fusion-crusted sɔrɔ nɛnɛ walima siraba kan fiɲɛbɔ kɔfɛ, u tɛ radiyowasiyɔn ye pewu, wa u tɛ baga ye, hali ni a yɔrɔ kuraw bɛ se ka nɛnɛ walima ka sumaya; aw bɛ maga u la ni gan sanumanw dɔrɔn ye walima ni papiye ye ni aw bɛ u mara dɔnniya kalan kama.)
• Ni sɔgɔsɔgɔninjɛ bɔra dugukolo kan izini, kurunbonkarila, nakɔsɛnɛyɔrɔ, walima tɛrɛn siraba binkanni na: Aw k’a miiri ko sisi dibiman, oranjɛ-bulu (azote dioxyde min bɛ bɔ nitiriti amoniyɔmu), walima jɛman bilenman wulilen na, fara minnu bɛ mɔgɔ faga, olu bɛ sɔrɔ fiɲɛ bilali la (amoniyɔmu jilama, kulori, fluoride hydrogène, dioxyde de sulfure, walima fosijɛni). Aw bɛ teliya ka a lajɛ fiɲɛ bɛ ci sira min fɛ: ni fiɲɛ bɛ ka ci aw ka sigida fan fɛ, aw bɛ bɔ fiɲɛ cɛmancɛ/fiɲɛ sanfɛyɔrɔ la min bɛ se degere 90 ma, walima aw bɛ aw yɛrɛ datugu kɔnɔna so kɔnɔ min ma tiɲɛ, ni finɛtiri karilenw bɛɛ datugulen don ni plastiki finiw ni duct tape ye ani HVAC fiɲɛbɔlanw bɛɛ datugulen don ka ye chemical spills and hazmat releases.

Architectural glass types and how they fail under blast overpressure¶

Not all windows behave the same way when struck by an atmospheric shockwave. Knowing which type of glazing is installed in the rooms around you helps you assess your immediate laceration risk during an emergency:

Special protocols for schools, hospitals, and mass-gathering venues¶

When a blinding meteor flash or distant industrial explosion occurs during weekday daytime hours, teachers, hospital staff, and retail managers are responsible for dozens or hundreds of people who will instinctively rush toward the windows at the exact same moment:

1. In school classrooms and lecture halls:
2. Never allow students to run to the classroom windows to look at a bright sky flash or vapor trail. In historical airburst events, children suffered severe facial and ocular lacerations because whole classes crowded against tall annealed classroom windows during the 90-second delay before the sonic boom arrived.
3. Execute an immediate "Drop, Cover, and Hold On (Away from Glass)" or Hallway Transfer: If you have more than 15 seconds (for example, a high-altitude meteor trail in the sky), briskly march all students out of the windowed classroom into the windowless central interior corridor, pull the classroom doors shut, and have everyone sit on the floor with their backs against the interior concrete block wall and their arms covering their heads. If there is no time to exit the classroom, command every student to drop immediately underneath their solid wood/steel desks facing away from the window wall, just as in an dugukoloyɛrɛyɛrɛ.
4. Dɔgɔtɔrɔsow la, mɔgɔkɔrɔbaw ka so, ani denmisɛnninw ka denmarayɔrɔw la:
5. Aw bɛ wotoro dilanw ni inkubatɛriw yɔrɔ janya lamini finɛtiriw la walima k’u lamini fo degere 180: Ni banabagatɔ min tɛ se ka lamaga, o ka dilan bɛ finɛtiri kɛrɛfɛ ni flash walima izini sisi koloma yɔrɔjan dɔ bɔra, aw bɛ danbe rido girinman sama ANI finɛtiri fiyentɔw datugulen, ka dilan caster freinw bila, ka dilan sama ka don sow kɔnɔ walima ka dilan kunkolo wuli walasa sennasanbara ka kɛ ɲɛ bɛ finɛtiri la ka matiriyali barajuru ni finimugumugu sama ka taa sanfɛ banabagatɔ ɲɛda ni a disi kan sani jikuru ka se.
6. In supermarkets, big-box retail stores, and warehouses:
7. Move shoppers away from the massive front plate-glass entrance facade and out from underneath glass skylights or high stacked pallet racks (where a sudden 5-kilopascal air pressure jolt can topple unstrapped top-shelf merchandise).

Preparing your home, school, or business against blast glass hazards¶

If you live or work within 5 kilometers (3 miles) of a petrochemical refinery, fuel storage farm, grain elevator, munitions facility, or industrial rail yard, or simply want to protect large windows from storm debris and shockwaves:

• Apply 4-mil to 8-mil (100-to-200-micron) clear polyester Anti-Shatter Safety Window Film: Professionally installed or DIY daylight-application security window film bonds tightly to existing window glass. When a shockwave shatters the pane, the tough polyester film holds 95 percent of the broken glass pieces stuck together in a single flexible sheet rather than allowing thousands of loose daggers to fly across the room.
• Install laminated safety glass (ANSI Z97.1 / . EN 356) when replacing large picture windows: Laminated glass sandwiches a tough polyvinyl butyral (PVB) interlayer between two sheets of glass, just like a car windshield.
• Hang heavy, closely woven curtains or shear-retention drapes behind large windows: Keeping sheer or heavy drapes drawn across glass windows catches a significant portion of low-velocity glass fragments during modest overpressure events.
• Arrange beds, cribs, and office desks away from direct alignment with large exterior windows: Never place a child's crib or bed directly underneath a large annealed glass window.

Everyone should consider completing a hands-on First Aid, Stop the Bleed, and CPR course through the Red Cross, St John Ambulance, or a local emergency training provider so you can manage severe glass lacerations in the critical minutes before ambulances arrive.

Ɲininkali minnu bɛ kɛ tuma caman na¶

Why is there a long silent delay between seeing a meteor fireball or distant explosion and getting hit by the shockwave?¶

Light from an atmospheric meteor airburst or an industrial detonation travels at 300,000 kilometers per second (186,000 miles per second), reaching your eyes instantly. However, the physical blast shockwave is an acoustic pressure wave that travels through the atmosphere near the speed of sound, roughly 340 meters per second (about 1 kilometer every 3 seconds, or 1 mile every 5 seconds). If a meteor explodes 30 kilometers (19 miles) overhead, or a refinery explodes 6 kilometers (3.7 miles) away, there will be a silent gap of 18 to 90 seconds after the bright flash before the destructive shockwave arrives and blows in windows.

Why do so many people get injured by glass during a meteor airburst or port explosion?¶

Because the blinding flash of light or towering smoke column arrives silently at first, natural human curiosity causes people inside homes, schools, and offices to walk right up to large windows to look outside and film the sky. Seconds or minutes later, when the invisible supersonic overpressure wave slams into the building, it shatters annealed window glass into thousands of razor-sharp shards propelled inward across rooms at 30 to 60 meters per second (65 to 135 mph), striking anyone standing in front of the glass in the face, eyes, and neck.

Should I open my mouth or cover my ears when I know a blast shockwave is about to hit?¶

Yes, both: drop low away from windows, cup your palms over your outer ears (or use your forearms to shield your head and neck), and open your mouth slightly with a relaxed jaw. Opening your mouth allows the sudden atmospheric overpressure spike to travel up your Eustachian tube into the middle ear at the same moment it pushes against the outside of your eardrum, helping equalize pressure across the tympanic membrane and reducing the likelihood of a ruptured eardrum.

Are meteorites that fall to the ground after a sky airburst radioactive or glowing hot?¶

No, natural meteorites from asteroids are not radioactive, and contrary to popular myth, small meteorite fragments that reach the ground after an atmospheric airburst are usually cold or only mildly warm to the touch. Only the outer 1-millimeter surface melts during the brief few seconds of hypersonic atmospheric entry before the ablating crust is blown away and the rock falls the last 20 kilometers (12 miles) for several minutes through freezing minus 40°C (minus 40°F) stratospheric air. However, never touch an unidentified smoking metallic object if it could be aerospace orbital debris containing toxic hydrazine propellant.

Sosow sɛgɛsɛgɛra¶

• National Aeronautics and Space Administration (NASA Planetary Defense Coordination Office, United States): Bolide Airburst Physics, Chelyabinsk Superbolide Injury Epidemiology, and Asteroid Impact Preparedness
• Federal Emergency Management Agency (FEMA, United States): Reference Manual to Mitigate Potential Terrorist and Industrial Blast Attacks Against Buildings (FEMA 426: Blast Overpressure Thresholds and Glazing Protection)
• Centers for Disease Control and Prevention (CDC, United States): Explosions and Blast Injuries: A Primer for Clinicians (Primary, Secondary, Tertiary, and Quaternary Blast Trauma)
• Health and Safety Executive (HSE, United Kingdom): * Vapor Cloud Explosions, Industrial Blast Overpressure Zones, and Window Glazing Hazard Management*
• United Nations Office for Outer Space Affairs (UNOOSA) and International Asteroid Warning Network (IAWN): Public Safety Messaging for Atmospheric Bolide Airbursts

Gafe minnu bɛ tali kɛ o ko la¶

• Joli jugumanba ani tourniquet kɛli
• Eye injuries: chemical splashes, foreign objects, and trauma
• Broken window: emergency board-up and glass safety
• Chemical spills and hazardous materials releases
• Carbon monoxide poisoning