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:2/1/2017)... , February 1, 2017 IDTechEx Research, ... on emerging technology, announces the availability of a new report, ... Continue Reading ... ... industrial and collaborative robots. Source: IDTechEx Report "Sensors for Robotics: Technologies, ...
(Date:1/26/2017)... -- Acuity Market Intelligence today released the 2017 "Ten ... characterizes 2017 as a "breakout" year for biometrics ... new understanding of the potential benefits these technologies ... are often perceived as threats to privacy and ... Acuity Market intelligence. "However, taken together these technologies ...
(Date:1/23/2017)... DENVER , Jan. 23, 2017  The latest ... biometric smartphone prices have dropped dramatically. The quarterly average ... Q1 2013 to $276 in Q4 2016.  There are ... average price of $116, up from just 28 a ... According to Maxine Most , Acuity ...
Breaking Biology News(10 mins):
(Date:2/16/2017)... , Feb. 16, 2017   Biostage, Inc. ... "Company"), a biotechnology company developing bioengineered organ implants to ... bronchus and trachea, announced today the closing on February ... 20,000,000 shares of common stock and warrants to purchase ... of $8.0 million. The offering was priced at $0.40 ...
(Date:2/16/2017)... ... February 16, 2017 , ... AxioMed announced ... professor and Harvard trained surgeon, completed the procedure on Monday, Jan. 30 at ... practicing female physician suffering from degenerative disc disease with radiculomyelopathy, as a result ...
(Date:2/15/2017)... ... February 15, 2017 , ... Executive search firm, Slone ... with GenePeeks. Matt is a veteran life sciences and molecular diagnostics executive ... focused on identifying inherited disease risk in future generations. In his new role, ...
(Date:2/15/2017)... , Feb. 15, 2017 Windtree Therapeutics, ... company focused on developing aerosolized KL4 surfactant therapies ... completed a $10.5 million private placement of convertible ... has sufficient capital to fund its operations through ... data release in mid-2017. Windtree has ...
Breaking Biology Technology:
Cached News: