Weather affects timing of some natural hazards | Science News

Real Science. Real News.

Science News is a nonprofit.

Support us by subscribing now.


Weather affects timing of some natural hazards

Seasonal patterns in earthquakes and volcanic eruptions can be linked to rain and snow

5:02pm, December 9, 2011

SAN FRANCISCO — If you want to know the chance of an earthquake in the Himalayas or a volcanic eruption in Iceland, check the calendar. Seasonal patterns of rainfall and snowfall can affect how often quakes and volcanoes go off, scientists reported December 8 at a meeting of the American Geophysical Union.

In the Himalayas, the weight of water from monsoon rains helps dampen seismicity for a few months each year, says geophysicist Thomas Ader of Caltech. Seismic records collected from 1998 to 2004 show that the number of quakes drops in the rainy summer months and rebounds when things dry out.

Water from monsoon storms runs off the mountains and into India, where its weight bends the Earth’s crust slightly. From season to season, this bending causes the surface to move back and forth, as recorded by Global Positioning System stations, in time with the rise and fall in earthquake frequency.

Calculations by Ader and his colleagues suggest that the

This article is only available to Science News subscribers. Already a subscriber? Log in now.
Or subscribe today for full access.

Get Science News headlines by e-mail.

More from Science News

From the Nature Index Paid Content