Nepal quake’s biggest shakes relatively spread out | Science News

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Nepal quake’s biggest shakes relatively spread out

Minute measurements of ground movement links frequency to type of damage

By
2:00pm, August 6, 2015
Dharahara Tower before and after the 2015 Nepal Quake

SHAKEN APART  The April 25 Nepal earthquake toppled tall structures such as the 62-meter-tall Dharahara Tower, shown before and after the quake. Most of the earthquake’s waves were at relatively lower frequencies that are damaging to tall structures.

The April 25 Nepal earthquake killed more than 8,000 people and caused several billion dollars in damage, but new research suggests the toll could have been a lot worse.

GPS readings taken during the quake indicate that most of the tremors vibrated through the ground as long shakes rather than quick pulses. That largely spared the low-lying buildings that make up much of Nepal’s capital, Kathmandu, geophysicists report online August 6 in Science. Those same low-frequency rumbles, though, toppled Kathmandu’s handful of larger buildings, such as the historic 62-meter tall Dharahara Tower.

Understanding why the fault produced a quake at such low frequencies could help seismologists better identify future seismic hazards, says Jean-Philippe Avouac of the University of Cambridge. “This could be some good news not only for this major fault, but also potentially for

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