Featured Research

from universities, journals, and other organizations

Major offshore quake could surge inland to Seattle area

Date:
January 2, 2010
Source:
American Geophysical Union
Summary:
Large megathrust earthquakes occur on average every 550 years on the northern Cascadia subduction zone, where the Juan de Fuca tectonic plate subducts underneath the North American plate off the coast of Washington State. Scientists had thought that major earthquakes were likely to occur only offshore, but a new analysis shows that a giant earthquake could extend deeper along the subduction zone, and thus farther inland.

Large megathrust earthquakes occur on average every 550 years on the northern Cascadia subduction zone, where the Juan de Fuca tectonic plate subducts underneath the North American plate off the coast of Washington State. Scientists had thought that major earthquakes were likely to occur only offshore, but a new analysis by Chapman and Melbourne shows that a giant earthquake could extend deeper along the subduction zone, and thus farther inland.

Related Articles


The authors analyzed 15 small, nonearthquake periodic slip events known as episodic tremor and slip (ETS) detected between 1997 and 2008 to develop a model of seismogenic coupling between the two tectonic plates.

Their model accurately predicts the deformation of the overlying North American plate as measured by Global Positioning System stations and shows that seismic stress accumulation reaches to about 25 kilometers (15.5 miles) depth, or about 60 km (37.3 mi) inland, rather than stopping offshore at about 15 km (9.3 mi) depth, as had been thought. This indicates that the Seattle metropolitan areas could be subject to a magnitude 8.9 earthquake (from just the Washington State segment of Cascadia).

The authors conclude that results point to a need to reassess the Cascadia megathrust seismic hazard.

The research is published in Geophysical Research Letters. Authors include James S. Chapman and Timothy I. Melbourne: Department of Geological Sciences, Central Washington University, Ellensburg, Washington, USA


Story Source:

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


Journal Reference:

  1. Chapman et al. Future Cascadia megathrust rupture delineated by episodic tremor and slip. Geophysical Research Letters, 2009; 36 (22): L22301 DOI: 10.1029/2009GL040465

Cite This Page:

American Geophysical Union. "Major offshore quake could surge inland to Seattle area." ScienceDaily. ScienceDaily, 2 January 2010. <www.sciencedaily.com/releases/2009/12/091230183449.htm>.
American Geophysical Union. (2010, January 2). Major offshore quake could surge inland to Seattle area. ScienceDaily. Retrieved January 29, 2015 from www.sciencedaily.com/releases/2009/12/091230183449.htm
American Geophysical Union. "Major offshore quake could surge inland to Seattle area." ScienceDaily. www.sciencedaily.com/releases/2009/12/091230183449.htm (accessed January 29, 2015).

Share This


More From ScienceDaily



More Earth & Climate News

Thursday, January 29, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Scientists Say Earliest Snakes Lived Alongside The Dinosaurs

Scientists Say Earliest Snakes Lived Alongside The Dinosaurs

Newsy (Jan. 28, 2015) Wrongly categorized as lizard fossils, snake fossils now show the reptile could have developed earlier than we thought — 70 million years earlier. Video provided by Newsy
Powered by NewsLook.com
Mobile Heat Tech the Google Maps of Energy Savings

Mobile Heat Tech the Google Maps of Energy Savings

Reuters - Innovations Video Online (Jan. 28, 2015) A Boston company has come up with a new and efficient way for homeowners to save money on energy costs, a timely innovation given the impact of this week&apos;s snow storms in the northeast US. The company is using a newly developed technology that can map heat signatures for entire cities in matter of days, generating data that could potentially produce billions in energy savings. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
Time Lapse: Sculptures Created from 30 Tons of Snow

Time Lapse: Sculptures Created from 30 Tons of Snow

Rumble (Jan. 28, 2015) Students in North Finland use 30 tons of snow and one ton of ice to build a massive photography display and sculpture installation. Five days of work condensed into a one-minute time lapse! Video provided by Rumble
Powered by NewsLook.com
Scientists Hold Emergency Meeting to Save Endangered Rhinos

Scientists Hold Emergency Meeting to Save Endangered Rhinos

AFP (Jan. 28, 2015) Conservationists and scientists hold talks in Kenya to come up with a last ditch plan to save the northern white rhinoceros from extinction. Duration: 01:06 Video provided by AFP
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