Anonymous asked in Science & MathematicsEarth Sciences & Geology · 1 decade ago

What happens before a volcano errupts, and before earthquakes?

My friend lives in Pocos de Caldas, and they say that it's gonna errupt on May 11th, or it's gonna happen an earthquake on that day over there. I'm worried about him, so what happens before those things happen?

5 Answers

  • 1 decade ago
    Favorite Answer

    If you find the fallowing changes you can suspect one.But you can not predict.

    Unusual animal behaviors before earthquakes

    Mammals Nervous, restless, irritated, panic and act “crazy”.

    Human Headache, nausea, urge to vomit, giddiness, dizziness, heart complaints, nervous

    disorders, hysteria, bad weather symptoms.

    Dogs Bark loudly, whine ingratiatingly, anxious. Act as if tracking an unseen enemy; panic and bite owners, bark and pull owners outside, howl insufferably as if they have rabies.

    Cats Restless, meow pathetically, take kittens outside, climb high trees, jerk ears, lay ears back, leave home for days, disappear.

    Rats Disappear, fuss, panic, running on wires.

    Horses Stamp, snort, tremble, jump, buck, fall to the ground.

    Cows Bellow, crowd together, run away in panic.

    Pigs Aggressively bite each other, dig under fences, attempt to climb walls.

    Deer Leave bush and forest, do not fear humans, run to humans, run aimlessly.

    Rabbits Jump and run around.

    Sea lions Swim in zigzags, act agitatedly, fuss when out of the water, do not ear food.

    Dolphins Nervous, do not obey orders, leap put of the water.


    Birds Stop singing, become excited, flocks fly restlessly, cry weirdly, some die.

    Bats Fly in the daytime

    Chickens Flap wings, shriek as if in terror, fly, fly to roofs. Cocks crow at midnight.

    Hens Lay no eggs, fewer eggs or eggs with two yolks.

    Ducks Avoid entering water, cry, act aggressively, bite humans.

    Sparrows Flutter in swarms, flutter down while flying, no twittering.

    Seagulls Fly inland, mew in sky, stay away from the sea.

    Parakeets High pitched chirping, flutter wings, fly at night, stay on fence, die.

    Reptiles Come out of hibernation.

    Crocodiles Call, leave the water for land or leave cages for the forest.

    Snakes Come out to the open in winter, swarm in bamboo clumps in summer.

    Turtles Wake from hibernation, climb on others apparently in panic, run.

    Crabs Leave wet habitats and crawl ashore, large numbers found dead.

    Fish Float and align in one direction, leap out of water, move violently, die.

    Turn upside down, act as if in turmoil, swarm, bigger fishing catches.

    Deep sea fish appear near surface, do not eat, sea fish swim up rivers.

    Eels Crowd onshore, disappear.


    Ants Leave habitats carrying their eggs, swarm, enter houses.

    Bees Evacuate hives in a frenzy, buzz agitatedly and sting aggressively.

    Cockroaches Swarm close to metal ware.

    Dragonflies Swarm close to metal ware.

    Earthworms Come out of soil, aggregate.

    Flies Swarm and cling to sweaty skin, fly in circles, rotate themselves.

    Silkworms Unusual alignment.

    Plant anomalies before earthquakes.

    Blooming ahead of season

    Potato Two months Vines bloom.

    Apricot Six weeks Trees bloom in winter.

    Early flowering & early crops

    Rice A few weeks before Small plants, early crops,

    Bar-code leaves.

    Orchid One day before Sways without wind.

    Mimosa At or just before Closes leaves and droops.

    Tree leaves Just before Shake without wind.

    Malfunctioning home electric appliances before earthquakes.

    Appliance Behaviors

    Car navigators Fluctuation of the pointer arrow.

    Clocks (quartz) Stopping or sudden movements of the second hand.

    Fast forward and backward movement or delayed movement.

    Fluorescent lamps Dimming of light as during thunderstorms.

    Intercoms Spontaneous buzzing sounds, or not functioning.

    Mobile phone Ringing & light but no record of caller.

    Do not function, make odd sounds.

    Radio (AM) Spontaneous switching and loud sounds, pulsed noise.

    Refrigerators Strange compressor noises, spoiled yogurt.

    TVs Spontaneous switching, speckling and flicker.

    Barber-pole color, lines, image disortion, white bands, loss of colour, reversion to black and white, channel fluctuations.


    Earthquake precursor phenomena in the sky and atmosphere.


    Phenomena in the sky Preseismic (time) Coseismic

    Earthquake light (EQL) A day or a few hours Flash and arc just before

    Earthquake fog (EQF) A few hours or just before Sudden dense fog

    Earthquake cloud (EQC) A few days, 8 days A dragon cloud appears

    Yellow sky A day Becomes dark

    Short rainbows A few days …

    Haloed sun A day to a few hours …

    Elongated or red moon A day …

    Stars appear close A day Advice him to fix on earthquake alarm in his building …

    Source(s): My research work in early warning.
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  • Anonymous
    1 decade ago

    The belief that animals can predict earthquakes has been around for centuries.

    In 373 B.C., historians recorded that animals, including rats, snakes and weasels, deserted the Greek city of Helice in droves just days before a quake devastated the place.

    Accounts of similar animal anticipation of earthquakes have surfaced across the centuries since. Catfish moving violently, chickens that stop laying eggs and bees leaving their hive in a panic have been reported. Countless pet owners claimed to have witnessed their cats and dogs acting strangely before the ground shook—barking or whining for no apparent reason, or showing signs of nervousness and restlessness.

    But precisely what animals sense, if they feel anything at all, is a mystery. One theory is that wild and domestic creatures feel the Earth vibrate before humans. Other ideas suggest they detect electrical changes in the air or gas released from the Earth.

    Earthquakes are a sudden phenomenon. Seismologists have no way of knowing exactly when or where the next one will hit. An estimated 500,000 detectable quakes occur in the world each year. Of those, 100,000 can be felt by humans, and 100 cause damage.

    One of the world's most earthquake-prone countries is Japan, where devastation has taken countless lives and caused enormous damage to property. Researchers there have long studied animals in hopes of discovering what they hear or feel before the Earth shakes in order to use that sense as a prediction tool.

    American seismologists, on the other hand, are skeptical. Even though there have been documented cases of strange animal behavior prior to earthquakes, the United States Geological Survey, a government agency that provides scientific information about the Earth, says a reproducible connection between a specific behavior and the occurrence of a quake has never been made.

    "What we're faced with is a lot of anecdotes," said Andy Michael, a geophysicist at USGS. "Animals react to so many things—being hungry, defending their territories, mating, predators—so it's hard to have a controlled study to get that advanced warning signal."

    In the 1970s, a few studies on animal prediction were done by the USGS "but nothing concrete came out of it," said Michael. Since that time the agency has made no further investigations into the theory.

    Erratic Behavior in Dogs

    Researchers around the world continue to pursue the idea, however. In September 2003 a medical doctor in Japan made headlines with a study that indicated erratic behavior in dogs, such as excessive barking or biting, could be used to forecast quakes.

    There have also been examples where authorities have forecast successfully a major earthquake, based in part on the observation of the strange antics of animals. For example, in 1975 Chinese officials ordered the evacuation of Haicheng, a city with one million people, just days before a 7.3-magnitude quake. Only a small portion of the population was hurt or killed. If the city had not been evacuated, it is estimated that the number of fatalities and injuries could have exceeded 150,000.

    A volcano may begin to show signs of unrest several months to a few years before an eruption. In these cases, however, a warning that specifies when it might erupt months to years ahead of time are extremely rare.

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  • 1 decade ago

    Earthquakes and volcanic eruptions *cannot* be predicted to the day. The best science can do is state that certain volcanoes and earthquake faults are active and have a certain chance of erupting or rupturing over a certain period of time (usually years to millennia).

    Earthquakes occur with little or no warning. Foreshocks may or may not occur, and any other changes occur too inconsistently to use as accurate forecast indicators. Volcanic eruptions, on the other hand, usually follow a specific course, with the first indications of upwelling magma occurring days to weeks before the main eruption. These indications are in the form of small earthquakes and small eruptions of steam and ash. A specific type of earthquake called a harmonic tremor is a unique indicator of magma rising in the volcanic vent and usually indicates that an eruption will occur soon.

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  • PoppaJ
    Lv 5
    1 decade ago

    . Prior to an earthquake, the ground may rise an almost imperceptible amount in some place and/or fall an imperceptible amount in other places. Ther may also be a rise in the release of radon gas form the rocks, which may or may not be measurable at the surface.

    . Prior to a volcanic eruption, the most common precursor is the rumbling of magma moving underground. but a rise of the existing volcanic mount or the surrounding ground has also been observed, and is due to the rise of magma below the surface.

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  • 3 years ago

    possibly greater risk of Lake Taupo erupting. If i became you i might flow to the South Island. yet it somewhat is possibly no longer a reliable concept. there is the ordinary earthquake down there and that i've got faith Banks Peninsula is a volcano. If i became you i might seem for a sparkling coverage provider.

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