The USGS operates 360 sensors stations through southern California. In the Santa Monica mountains, the first USGS seismograph registers the quake. After it hit the epicenter, it expanded nearly three miles before a piece of government equipment noticed.Ħ:25 a.m., 38.24 seconds. An earthquake seems to ring outward from that spot, but those concentric rings are really just where that expanding sphere of vibrations meets the ground.Ħ:25 a.m., 37 seconds. When I talked to Douglas Given, a geophysicist at the United States Geological Survey (USGS), he estimated it took Monday’s quake 1 to 1.5 seconds to travel to reach the epicenter. The first place that sphere touches the ground becomes the epicenter. After a fault slips at a quake’s hypocenter, it emits energy outward in an expanding sphere. While that’s a fine description of what the quake feels like on the ground, it belies that earthquakes are 3D. When we imagine earthquakes, we often imagine concentric rings of vibrations traveling outward from the center. It took about a second to travel the 9.9 km until it hit the ground near Meadowcrest Road in Westwood, Los Angeles, a few blocks away from the Bel-Air Presbyterian Church.
The vibration from that slip traveled upward. In the eight minutes that passed-from tremor to coverage-what happened?Ħ:25 a.m., 36.8 seconds. On Monday, six miles underground-a fault line slipped. Indeed, the a story was written by a program, but read like normal newspaper prose. This information comes from the USGS Earthquake Notification Service and this post was created by an algorithm written by the author.
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