Title : "Seismometers can scan the ground for the 'P waves,' or compression waves, which precede the slower and more powerful 'S waves,' or shear waves..."
link : "Seismometers can scan the ground for the 'P waves,' or compression waves, which precede the slower and more powerful 'S waves,' or shear waves..."
"Seismometers can scan the ground for the 'P waves,' or compression waves, which precede the slower and more powerful 'S waves,' or shear waves..."
"... that are responsible for severe earthquake damage, like lightning before thunder. Using the P waves, a local data-processing center can calculate the likely reach and magnitude of a quake moments after it begins. The resulting alert, dispatched at the speed of light, usually beats the S waves, which ripple through rock at about two miles per second. To call the warning 'early' is generous. It usually arrives between a few seconds and less than a minute ahead of the quake—advance notice that, in duration, is somewhere between a sneeze and a red light.... In the past few decades, more than half of earthquake injuries in the U.S. have been caused by people or things falling—two occurrences easily avoided if you have time to take cover beneath a sturdy piece of furniture. For those who are landing planes, assembling electronics, operating cranes, or drilling into molars, even the smallest warning would be welcome. You might have just enough time to lock the wheels on your wheelchair, or to remove your scalpel from your patient’s chest.... The brief window for action created by the systems doesn’t allow for hesitancy or confusion.... To some, an advance warning might seem like an invitation to evacuate, or a prompt to check on other family members. Many earthquake myths persist—doorframes are no good, it turns out—and there are still gaps in public awareness: What do you do if you get the alert in bed? (According to fema, you should turn face down and cover your neck and head with a pillow.)"
From "There’s an Earthquake Coming!/The newest warning systems give users ten seconds’ notice. What can be done in that time?" (The New Yorker).
"... that are responsible for severe earthquake damage, like lightning before thunder. Using the P waves, a local data-processing center can calculate the likely reach and magnitude of a quake moments after it begins. The resulting alert, dispatched at the speed of light, usually beats the S waves, which ripple through rock at about two miles per second. To call the warning 'early' is generous. It usually arrives between a few seconds and less than a minute ahead of the quake—advance notice that, in duration, is somewhere between a sneeze and a red light.... In the past few decades, more than half of earthquake injuries in the U.S. have been caused by people or things falling—two occurrences easily avoided if you have time to take cover beneath a sturdy piece of furniture. For those who are landing planes, assembling electronics, operating cranes, or drilling into molars, even the smallest warning would be welcome. You might have just enough time to lock the wheels on your wheelchair, or to remove your scalpel from your patient’s chest.... The brief window for action created by the systems doesn’t allow for hesitancy or confusion.... To some, an advance warning might seem like an invitation to evacuate, or a prompt to check on other family members. Many earthquake myths persist—doorframes are no good, it turns out—and there are still gaps in public awareness: What do you do if you get the alert in bed? (According to fema, you should turn face down and cover your neck and head with a pillow.)"
From "There’s an Earthquake Coming!/The newest warning systems give users ten seconds’ notice. What can be done in that time?" (The New Yorker).
Thus articles "Seismometers can scan the ground for the 'P waves,' or compression waves, which precede the slower and more powerful 'S waves,' or shear waves..."
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