DRRM: Volcanic Hazards

00:07:49
https://www.youtube.com/watch?v=DEtRC35ln94

Summary

TLDRIty lahatsary ity dia mandrakotra ny loza ateraky ny volkano, manazava ny karazany sy ny fiantraikany amin'ny olona sy ny tontolo iainana. Ny loza lehibe dia ahitana ny fivoahan'ny lava, izay mazàna mitondra vokany mangina saingy afaka manimba ny tany sy ny fananana. Ny ash fall dia afaka miteraka fahasimbana amin'ny fiaramanidina sy ny tanimboly. Ny pyroclastic flows no loza tena mampidi-doza indrindra, afaka manimba zavatra rehetra amin'ny làlany. Ny lahar, ny entona volkanika, ny debris avalanche, ary ny ballistic projectiles dia fanampiny loza izay mitranga mandritra ny fipoahana volkanika. Ny fiarovana sy ny fahalalana tsara momba ireo loza ireo dia manan-danja amin'ny fiarovana ny olona sy ny fananana.

Takeaways

  • 🌋 Fahatakarana ny loza ara-volkanika dia ilaina amin'ny fiarovana.
  • 🔥 Ny lava flow dia mitarika fiantraikany lehibe amin'ny fananana sy ny tanimboly.
  • 🌪️ Ny ash fall dia afaka manimba ny fiaramanidina sy ny visibilite.
  • 💨 Ny pyroclastic flows no loza tena mampidi-doza indrindra.
  • 🌊 Ny lahar dia avy amin'ny fikorianana rano sy akora volkanika.
  • 💨 Ireo entona volkanika dia mety hiteraka fahasimbana sy olana ara-pahasalamana.
  • 🚨 Ny fahaizana sy ny fepetra dia manan-danja amin'ny fiarovana.
  • 🏔️ Ny debris avalanche dia vokatry ny fivontosana volkanika.
  • 🏹 Ny ballistic projectiles dia akora mitranga avy amin'ny volkano.
  • 🚧 Ny fianarana sy ny fanomanana dia manampy amin'ny fandraisana andraikitra amin'ny loza.

Timeline

  • 00:00:00 - 00:07:49

    Ity ny fianarana momba ny loza mitatao avy amin'ny volkano miaraka amin'ny mpampianatra Adele. Nohazavainy ny dikan'ny loza mitatao amin'ny volkano, dia nandidy ny karazana loza samihafa: ny lava, ash sy ny hafa. Ny lava dia mifangaro sy mandalo mandritra ny fipoahana, manimba ny tany sy ny fambolena. Ny fiantraikan'ny ash dia ahitana ny fisian'ny fahalemen'ny fahitana sy ny fatiantoka amin'ny tany fambolena, raha ny pyroclastic flows indray dia loza lehibe ho an'ny fiainana sy ny fananana. Noraisina ihany koa ny lahars, gazy volkano, ary ny fanjaitra avy amin'ny volkano, izay samy mitondra loza sy fahavoazana lehibe. Farany, naseho fa ny loza dia miteraka fiantraikany ratsy ho an'ny olombelona sy ny tontolo iainana, izay mitaky fahamailoana sy fiomanana.

Mind Map

Video Q&A

  • Inona no atao hoe lava flow?

    Ny lava flow dia fivoahana mivantana avy amin'ny volkano, matetika mitondra vovoka lava ao amboniny.

  • Ahoana ny fiantraikan'ny ash fall?

    Ny ash fall dia mety hiteraka fahasimbana amin'ny tanimboly sy ny fiaramanidina, ary manimba ny visibilité.

  • Inona ny pyroclastic flows?

    Pyroclastic flows dia fivoahan'ny akora volkanika sy entona mikoriana haingana mankany ambany.

  • Inona no dikan'ny lahar?

    Ny lahar dia fikorianan'ny rivon-javatra miempo sy akora volkanika mifangaro amin'ny rano.

  • Inona ny entona volkanika?

    Ireo entona toy ny haran-dranon'ny rano, dioksidra sulfur, ary entona hafa, dia mivoaka avy amin'ny volkano.

  • Inona no mety ho vokany raha misy pyroclastic flow?

    Izy io dia afaka manimba ny fananana sy ny zavamiaina, ary mety hiteraka fahafatesana.

  • Inona avy ireo karazany hafa ankoatry ny lava flow sy ash fall?

    Ireo karazana hafa dia ahitana lahar, pyroclastic flows, entona volkanika, ary ny fiahiahiana.

  • Inona no dikan'ny ballistic projectiles?

    Ireo dia akora volkanika voatonga mivantana sy avionika mivoaka avy amin'ny vent ny volkano.

  • Inona no mahatonga ny debris avalanche?

    Ny debris avalanche dia vokatry ny fivontosana mitranga ateraky ny horohoro na ny fanaovana volkano.

  • Ahoana ny fomba hiatrehana ireo loza ateraky ny volkano?

    Ny fianarana sy ny fepetra fiarovana no zava-dehibe mba hiatrehana ireo loza ateraky ny volkano.

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Subtitles
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  • 00:00:03
    hey what's up everyone it's teacher
  • 00:00:05
    Adele and today we will have another
  • 00:00:07
    class in the disaster risk reduction
  • 00:00:10
    management focusing on volcanic hazards
  • 00:00:14
    so what are the different kinds of
  • 00:00:17
    volcanic hazards and volcanic phenomenon
  • 00:00:20
    before we go into that let us define
  • 00:00:22
    volcanic hazards volcanic hazards are
  • 00:00:25
    phenomena arising from volcanic activity
  • 00:00:28
    the pose potential threat to persons or
  • 00:00:31
    property in a given area within a given
  • 00:00:35
    period of time so let's go through them
  • 00:00:39
    one by one the first one is your lava
  • 00:00:43
    flow lava flows are stream like flows of
  • 00:00:47
    incandescent molten rock erupted from a
  • 00:00:51
    crater or fissure when lava is to
  • 00:00:54
    guest:and or very vicious it tends to
  • 00:00:58
    extrude extremely slowly forming the
  • 00:01:04
    lava domes just like what you can see
  • 00:01:06
    there in the picture at the right side
  • 00:01:09
    of your screen so what are the hazards
  • 00:01:12
    that this lava flow can bring to people
  • 00:01:15
    and the community lava flows rarely it's
  • 00:01:19
    red and even life because lava is like
  • 00:01:23
    what we said before usually moves slowly
  • 00:01:27
    a few centimeters per hour for solicit
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    flows to several kilometers per hour for
  • 00:01:34
    basaltic flows most characterize this as
  • 00:01:38
    quiet a fusion of
  • 00:01:41
    major hazards of lava flows are the
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    following the first earnest burying
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    crushing covering and burning everything
  • 00:01:52
    on its path so just like what we said
  • 00:01:56
    again lava can burn lava can brewery and
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    affected areas of the lava flow once it
  • 00:02:06
    solidifies it is rendered useless and
  • 00:02:11
    will not be useful anymore especially
  • 00:02:13
    for agricultural uses for you know years
  • 00:02:18
    Jew to the solid nature of the lava
  • 00:02:22
    deposit as you can see there in the
  • 00:02:24
    photo as we have there a big caterpillar
  • 00:02:27
    trying to crush everything and imagine
  • 00:02:31
    yourself trying to you know plant in
  • 00:02:34
    that kind of area or soil
  • 00:02:38
    yep it will not turn out well next one
  • 00:02:44
    is your ash fall or tempura fall so ash
  • 00:02:49
    fall or tough football or flower shower
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    our showers of airborne fine to coarse
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    grained volcanic particles that fall out
  • 00:03:00
    from the plumes of a volcanic eruption
  • 00:03:04
    Asheville distribution or dispersal is
  • 00:03:07
    very dependent on prevailing wind
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    directions now this photo over here is
  • 00:03:13
    from the Asheville from Mount Pinatubo
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    which is the kated from the Philippines
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    year 1991
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    so the massive effect of the eruption of
  • 00:03:25
    Mount Pinatubo did not just affect the
  • 00:03:29
    Philippines but the entire world so what
  • 00:03:35
    are the hazards and other effects of
  • 00:03:38
    Asheville or tephra fall first it can
  • 00:03:41
    cause poor or low visibility loss of
  • 00:03:45
    agricultural land and dangerous for
  • 00:03:49
    aircrafts asked abrasive ash can cost
  • 00:03:52
    the engines to fail and it also carries
  • 00:03:56
    harmful gases acids salt and close to
  • 00:04:00
    the vent heat so as you can see there we
  • 00:04:04
    have another picture this is the dc-10
  • 00:04:07
    30 resting on its tail Joo again to
  • 00:04:10
    mount pinatubo ash wall poor airplane
  • 00:04:15
    [Music]
  • 00:04:17
    next one is your pyroclastic flows and
  • 00:04:20
    surges or a pyroclastic density current
  • 00:04:23
    now this again this photo is from the
  • 00:04:27
    eruption of Pinatubo volcano pyroclastic
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    flows or turbulent mass of ejected
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    fragmented volcanic materials such as
  • 00:04:38
    ash and rocks mixed with hot gases that
  • 00:04:43
    flowed down slope at a very highest
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    speed so mostly you can see the
  • 00:04:48
    significance of movies you know a car
  • 00:04:50
    racing against a car racing against the
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    pyroclastic flows of the volcano and
  • 00:05:00
    surges are the more dilute or more
  • 00:05:03
    mobile derivatives or pyroclastic flow
  • 00:05:06
    so it's much smaller than output not
  • 00:05:11
    much
  • 00:05:11
    rocks so it's like smoke so what are the
  • 00:05:15
    hazards and effects of your pyroclastic
  • 00:05:17
    flow oh sorry for that very drastic
  • 00:05:20
    photos so what are the hazards and
  • 00:05:26
    effects of pyroclastic flows
  • 00:05:30
    it can destroy anything in its path by
  • 00:05:33
    direct impact burn site with hot rocks
  • 00:05:38
    to breathe burn forest farmlands destroy
  • 00:05:42
    crops and buildings and of course the
  • 00:05:45
    deadly effects include asphyxiation or
  • 00:05:48
    inhaling of hot ash and gases imagine
  • 00:05:52
    yourself
  • 00:05:53
    imagine yourself you know anything a
  • 00:05:55
    very hot air gas and it has ashes on it
  • 00:06:02
    of course and bro EU it can incinerate
  • 00:06:06
    you know burn you know crush you from
  • 00:06:11
    its impacts so let's move on to the next
  • 00:06:16
    one we have the lahars so the horrors
  • 00:06:20
    are rapidly flowing thick mixture of
  • 00:06:22
    volcanic sediments from the pyroclastic
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    materials and it is already mixed with
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    water as you can see there now this
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    photo is from the mud flow or the lahar
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    near my own volcano next one is your
  • 00:06:43
    volcanic gases gases and aerosols
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    released into the atmosphere
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    which include water vapour hydrogen
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    sulfide sulfur dioxide carbon monoxide
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    hydrogen chloride and hydrogen right so
  • 00:07:00
    those are the different volcanic gases
  • 00:07:04
    next one is your debris Avalanche or
  • 00:07:07
    volcanic landslides this is a massive
  • 00:07:11
    collapse of a volcano usually triggered
  • 00:07:14
    by an earthquake or volcanic eruption
  • 00:07:18
    and the last one is your ballistic
  • 00:07:21
    projectiles these are volcanic materials
  • 00:07:25
    directly ejected from the volcanoes vent
  • 00:07:28
    with force and trajectory so
  • 00:07:31
    photos like that yeah sorry
  • 00:07:36
    okay so that's it for our volcanic
  • 00:07:39
    hazards and if you have any questions
  • 00:07:41
    just comment down below this has been
  • 00:07:44
    teacher duh
  • 00:07:45
    bye
Tags
  • volcanic hazards
  • lava flow
  • ash fall
  • pyroclastic flows
  • lahars
  • volcanic gases
  • debris avalanche
  • ballistic projectiles
  • disaster risk
  • safety measures