HOME >> BIOLOGY >> NEWS
Sinking coastlines may precede large subduction zone quakes

detect it with a tiltmeter. We have shown that we can detect it in the paleoenvironment."

The study was conducted by Scott and Lipps, both micropaleontologists, along with Dalhousie undergraduate Andrea D. Hawkes and Rod Combellick of the Alaska Division of Geological and Geophysical Surveys in Fairbanks. A paper describing their findings will be published in the May/June issue of the Geological Society of America Bulletin.

The team surveyed salt marshes along the Pacific coast from Alaska to northern California, taking 12-foot deep cores to look for signs of past subsidence coinciding with evidence of a major quake, such as soil liquefaction and sand deposited by a tsunami. Subsidence is indicated by a temporary change in the types of microscopic organisms with shells specifically foraminifera and thecamoebians in the mud, as the formerly freshwater marshes sink and become brackish or saltwater marshes.

One marsh in Alaska apparently sank about half a foot starting perhaps 15 years before the devastating 1964 Alaska quake, which measured 9.2 on the Richter scale and generated a tsunami that killed dozens of people along the Pacific coast. Similarly, a core from a marsh in Oregon showed evidence of four large quakes over the past 3,000 years, each preceded by subsidence.

Seismologists estimate that the period between megathrust quakes along the Cascadia Subduction Zone, where the Pacific, Juan de Fuca and Gorda Oceanic plates creep under the North American plate, ranges from hundreds to thousands of years. This makes them hard to plan for, Scott noted. Precursory subsidence detected by tiltmeters would at least allow people along the coast to plan for a major quake and probable tsunami.

The indicator marshes are typically fresh water marshes within inches of the high tide mark, so that subsidence of a few inches increases slightly the saltiness of the march, either through salt spray or intrusion of salt water at high tide,
'"/>

Contact: Robert Sanders
rsanders@berkeley.edu
510-643-6998
University of California - Berkeley
20-Jan-2005


Page: 1 2 3 4

Related biology news :

1. Flawed studies assess dredge-and-fill programs to protect coastlines
2. NIH unprecedented genetic study may help identify people most at risk for alcoholism
3. CI launches unprecedented marine conservation initiatives
4. New law for resolution allows unprecedented sharpness in fluorescence microscopy
5. Singers (and parents) take note: Worst songbird rehearsals precede best debuts
6. New, automated tool successfully classifies and relates proteins in unprecedented way
7. Ability to listen to 2 things at once is largely inherited, says twin study
8. Link between obesity and enlarged heart discovered by University of Arizona researchers
9. Giant magnetocaloric materials could have large impact on the environment
10. Reproductive speed protects large animals from being hunted to extinction
11. Landmark study identifies large number of new proteins implicated in Huntingtons disease

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:3/15/2016)... 15, 2016 Yissum Research Development Company ... company of the Hebrew University, announced today the formation ... technology of various human biological indicators. Neteera Technologies has ... from private investors. ... detection of electromagnetic emissions from sweat ducts, enables reliable ...
(Date:3/10/2016)... PUNE, India , March 10, 2016 ... to a new market research report "Identity and Access ... SSO, & Audit, Compliance, and Governance), by Organization Size, ... Forecast to 2020", published by MarketsandMarkets, The market is ... to USD 12.78 Billion by 2020, at a Compound ...
(Date:3/8/2016)... N.C. , March 8, 2016   ... sensor technology, today announced it has secured $11M ... by GII Tech, a new venture fund being ... with additional participation from existing investors TDF Ventures ... the funds to continue its triple-digit growth and ...
Breaking Biology News(10 mins):
(Date:5/26/2016)... ... May 26, 2016 , ... ... are used in leading laboratories all over the globe. Their cute firefly logo ... to manufacturing awesome cuvettes, FireflySci makes spectrophotometer calibration standards that never require recalibration. ...
(Date:5/25/2016)... ... May 25, 2016 , ... Thailand’s ... at BIO 2016 in San Francisco. Located at booth number 7301, representatives from ... answer questions and discuss the Thai biotechnology and life sciences sector. , ...
(Date:5/25/2016)... Phoenix, AZ (PRWEB) , ... May 25, 2016 ... ... Arizona, Dr. Michael Fitzmaurice recently became double board-certified in surgery and surgery of ... 31, 2015. Dr. Fitzmaurice is no stranger to going above and beyond in ...
(Date:5/25/2016)... ... 25, 2016 , ... Scientists at the University of Athens say they have ... be hampering the research that could lead to one good one. Surviving Mesothelioma has ... now. , The team evaluated 98 mesothelioma patients who got a ...
Breaking Biology Technology:
Cached News: