Featured Research

from universities, journals, and other organizations

Ground Frequency Recovery After Strong Earthquakes

Date:
November 7, 2006
Source:
American Geophysical Union
Summary:
Because earthquake shock sometimes decreases the frequency at which the ground vibrates, especially at soft soil sites, the strength of strong ground motion during an earthquake is an important characteristic that can affect the degree to which geological structures and buildings collapse. Although most research focuses on the reduction in peak frequency of site response caused by strong ground motion, Sawazaki, et al. sought instead to document peak frequency recovery following large earthquakes.

Because earthquake shock sometimes decreases the frequency at which the ground vibrates, especially at soft soil sites, the strength of strong ground motion during an earthquake is an important characteristic that can affect the degree to which geological structures and buildings collapse.

Most research focuses on the reduction in peak frequency of site response caused by strong ground motion. But in an article published recently in the journal Geophysical Research Letters, Kaoru Sawazaki and colleagues at Japan's Tohoku University sought instead to document peak frequency recovery following large earthquakes.

By analyzing coda waves, which are seismic wave trains generated by energy scattering due to soil and crustal heterogeneities, the authors estimated peak frequency recovery using data from seismometers vertically separated in boreholes at two sites following Japan's 2000 Western Tottori Earthquake, and at a site following the 2003 Tokachi-Oki Earthquake.

The researchers found that the peak frequency at relatively solid sites after the Western Tottori Earthquake took a few years to recover to the value before the earthquake, but that the weak site after the Tokachi-Oki earthquake recovered within an hour.

Authors: Kaoru Sawazaki, Haruo Sat, Hisashi Nakahara, and Takeshi Nishimura: Department of Geophysics, Graduate School of Sciences, Tohoku University, Sendai, Japan.

Source: Geophysical Research Letters (GRL) paper 10.1029/2006GL027938, 2006


Story Source:

The above story is based on materials provided by American Geophysical Union. Note: Materials may be edited for content and length.


Cite This Page:

American Geophysical Union. "Ground Frequency Recovery After Strong Earthquakes." ScienceDaily. ScienceDaily, 7 November 2006. <www.sciencedaily.com/releases/2006/11/061106170115.htm>.
American Geophysical Union. (2006, November 7). Ground Frequency Recovery After Strong Earthquakes. ScienceDaily. Retrieved October 1, 2014 from www.sciencedaily.com/releases/2006/11/061106170115.htm
American Geophysical Union. "Ground Frequency Recovery After Strong Earthquakes." ScienceDaily. www.sciencedaily.com/releases/2006/11/061106170115.htm (accessed October 1, 2014).

Share This



More Earth & Climate News

Wednesday, October 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Earth Has Lost Half Its Vertebrate Wildlife Since 1970: WWF

Earth Has Lost Half Its Vertebrate Wildlife Since 1970: WWF

Newsy (Sep. 30, 2014) A new study published by the World Wide Fund for Nature found that more than half of the world's wildlife population has declined since 1970. Video provided by Newsy
Powered by NewsLook.com
Seismic Activity Halts Recovery at Japan Volcano

Seismic Activity Halts Recovery at Japan Volcano

AP (Sep. 30, 2014) Rescuers were forced to suspend plans to recover at least two dozen bodies from near the summit of Mount Ontake in central Japan on Tuesday after increased seismic activity raised concern about the possibility of another eruption. (Sept. 30) Video provided by AP
Powered by NewsLook.com
Dolphins Might Use Earth's Magnetic Field As A GPS

Dolphins Might Use Earth's Magnetic Field As A GPS

Newsy (Sep. 30, 2014) A study released Monday suggests dolphins might be able to sense the Earth's magnetic field and possibly use it as a means of navigation. Video provided by Newsy
Powered by NewsLook.com
How To Battle Stink Bug Season

How To Battle Stink Bug Season

Newsy (Sep. 30, 2014) Homeowners in 33 states grapple with stink bugs moving indoors at this time of year. Here are a few tips to avoid stink bug infestations. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins