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• Look out! Earthquake!

• What should you do during a big tremor?

• This is Dan.

• He recently arrived in this country to start a job.

• Suddenly, his office starts to shake and the building sways violently.

• Dan is from a country that doesn't have earthquakes, and he panics.

• Luckily, his coworker Rena is there to show him what to do.

• First, get under a desk for protection.

• If there's time, open a door to secure an exit.

• In a high rise building, tremors could continue for ten minutes, or more.

• Although the shaking may make you feel sick, the building is unlikely to collapse, so stay calm.

• Dan is impressed by how cool Rina is, but he wonders why high rise buildings sway with such long movements.

• Rena explains.

• The shaking movement due to an earthquake, is called seismic ground motion.

• The number of seconds for each back and forth movement is its period.

• Depending on the length of the period, the movement is either short or long period ground motion.

• The thicker the ground's sedimentary layers, the longer the period.

• Because cities usually built on planes composed of very thick sedimentary layers, they often experience long period ground motion.

• Each building has it's own period, which depends on the type of construction and height.

• Higher buildings have longer periods, and these are more likely to be the same as the ground motion.

• When a building's period is the same as that of the ground, this causes resonance, which greatly magnifies the shaking.

• That's why, even though the ground outside is only moving slightly, a tall building might be shaking violently.

• Dan now understands what's happening.

• The only reason desks and lockers don't move is that they are all securely fastened down.

• After the shaking stops, Dan asks Rena to lunch.

• "Not so fast." says Rena.

• Don't assume it's safe to go outside so quickly.

• If you're near the sea or a river, a tsunami might be coming.

• And after a major tremor, aftershocks make it dangerous to be near damaged structures, older buildings or cliffs that might collapse.

• Rena tells Dan he should train to be ready for an earthquake.

• In earthquake prone countries, communities hold disaster drills, and many facilities provide earthquake simulations.

• The latest facilities can simulate earthquakes in high rise buildings and many other scenarios.

• To find out what's available in your area, just look online.

• Thanks to Rena, Dan is now ready for life in an earthquake zone.

• The next weekend, he takes his family to an earthquake simulator.

• Now they'll know exactly what to do in a big quake.

• To stay safe during a major earthquake, the most important thing is knowledge.

• Official online disaster mitigation sites provide all the information you need.

• Remember, don't rush, stay calm, and help others.

Look out! Earthquake!

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# How to protect yourself during an earthquake

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林宜悉 posted on 2022/11/16
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