Featured Research

from universities, journals, and other organizations

Revised seismotectonic model for California Central Coast: More complex than previously thought

Date:
June 3, 2010
Source:
Seismological Society of America
Summary:
A new catalog of earthquake locations and focal mechanisms for the California Central Coast underscores the fault complexity of the region and identifies newly observed features offshore near San Luis Obispo.

A new catalog of earthquake locations and focal mechanisms for the California Central Coast underscores the fault complexity of the region and identifies newly observed features offshore near San Luis Obispo.

The Central Coast is bounded on the east by the San Andreas Fault, the major plate boundary fault, and lies between the greater San Francisco and Los Angeles areas. This coastal region is not as densely instrumented or as tectonically well understood as the San Andreas Fault or the major urban areas.

The identification of new faults, and the reinterpretation of known faults, suggests that further work is necessary to better constrain the seismic hazards of the Central Coast. While the locations and focal mechanisms (the direction of slip in an earthquake and the orientation of the fault on which it occurs) for aftershocks of the 2003 M6.5 San Simeon and 2004 M6.0 Parkfield earthquakes are similar to those found in previous aftershock studies, the seismicity features in the offshore region near San Luis Obispo are sharpened considerably by this study.

The most prominent newly-observed feature is the Shoreline Fault, a ~25 km-long vertical strike-slip fault running parallel to the coastline just offshore of Point Buchon. Several smaller strike-slip seismicity lineations are also observed in Estero Bay, along with a deep reverse structure at the depth of the top of the remnant subducted slab. Strike-slip faulting is observed along the Hosgri-San Simeon Fault system, up to ~10-15 km inland from the Hosgri Fault in Estero Bay and near Point Buchon, and on the onshore Rinconada and West Huasna Faults.

The Shoreline Fault in particular requires further study to better constrain its geometry, how it may connect to the Hosgri Fault or other faults to its east, its slip rate and whether it has produced large earthquakes in the past.

This research was recently published in the Bulletin of the Seismological Society of America (BSSA)


Story Source:

The above story is based on materials provided by Seismological Society of America. Note: Materials may be edited for content and length.


Journal Reference:

  1. Hardebeck et al. Seismotectonics and Fault Structure of the California Central Coast. Bulletin of the Seismological Society of America, 2010; 100 (3): 1031 DOI: 10.1785/0120090307

Cite This Page:

Seismological Society of America. "Revised seismotectonic model for California Central Coast: More complex than previously thought." ScienceDaily. ScienceDaily, 3 June 2010. <www.sciencedaily.com/releases/2010/06/100602215239.htm>.
Seismological Society of America. (2010, June 3). Revised seismotectonic model for California Central Coast: More complex than previously thought. ScienceDaily. Retrieved September 30, 2014 from www.sciencedaily.com/releases/2010/06/100602215239.htm
Seismological Society of America. "Revised seismotectonic model for California Central Coast: More complex than previously thought." ScienceDaily. www.sciencedaily.com/releases/2010/06/100602215239.htm (accessed September 30, 2014).

Share This



More Earth & Climate News

Tuesday, September 30, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Balloon Descends to Bottom of Croatian Cave

Raw: Balloon Descends to Bottom of Croatian Cave

AP (Sep. 29, 2014) An Austrian balloon pilot has succeeded in taking a balloon deep underground, a feat which he believes is a world first. (Sept. 29) Video provided by AP
Powered by NewsLook.com
Bodies Recovered from Japan Volcano Eruption

Bodies Recovered from Japan Volcano Eruption

AP (Sep. 29, 2014) Rescue crews finished recovering the remaining 27 bodies from atop Japan's Mount Ontake Monday. At least 31 people were killed Saturday in the mountain's first fatal volcanic event in modern history. (Sept. 29) Video provided by AP
Powered by NewsLook.com
Raw: Japan's Mount Ontake Erupts

Raw: Japan's Mount Ontake Erupts

AP (Sep. 27, 2014) A volcano erupted in central Japan on Saturday, sending a large plume of ash high into the sky and prompting a warning to climbers and others to avoid the area. (Sept. 27) Video provided by AP
Powered by NewsLook.com
California University Designs Sustainable Winery

California University Designs Sustainable Winery

Reuters - US Online Video (Sep. 27, 2014) Amid California's worst drought in decades, scientists at UC Davis design a sustainable winery that includes a water recycling system. Vanessa Johnston reports. Video provided by Reuters
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