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Ground shakes expose faraway earthquake hot spots

Slowdown in seismic waves map areas with temblor ingredients: weakened rock, fluid buildup

2:41pm, January 8, 2016
map of costa rica

WEAK SPOTS   A magnitude 7.6 earthquake that shook Costa Rica in 2012 revealed earthquake-prone weak spots in Earth’s crust, new research shows. Colored lines mark the intensity of shaking felt at that location from the epicenter (star), with yellow lines marking the more intense shaking.

Rumbling earthquakes could reveal faraway weak spots in Earth’s crust.

Following a 2012 earthquake that rattled Costa Rica, researchers noticed that the quake fractured underground rock tens of kilometers from its epicenter. Before the quake, that fractured region had already been weakened by pressurized fluids mixed in with the rock, the researchers propose online January 8 in Science Advances. Such weakened patches are more prone to shift and set off major earthquakes. So monitoring where future quakes fracture rock will help scientists better understand how the fluids that help spawn earthquakes disperse around Earth’s crust, says study coauthor Esteban Chaves. That could let seismologists better forecast where titanic tremors are likeliest to strike.

“If we can characterize the structure of seismic faults, we can better understand why earthquakes behave the way they do,&rdquo

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