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:4/5/2017)... , April 5, 2017  The Allen Institute ... Allen Cell Explorer: a one-of-a-kind portal and dynamic digital ... 3D imaging data, the first application of deep learning ... human stem cell lines and a growing suite of ... platform for these and future publicly available resources created ...
(Date:4/5/2017)... -- KEY FINDINGS The global market for ... of 25.76% during the forecast period of 2017-2025. The ... the growth of the stem cell market. ... INSIGHTS The global stem cell market is segmented on ... stem cell market of the product is segmented into ...
(Date:4/3/2017)... 3, 2017  Data captured by IsoCode, ... detected a statistically significant association between the ... treatment and objective response of cancer patients ... predict whether cancer patients will respond to ... well as to improve both pre-infusion potency testing ...
Breaking Biology News(10 mins):
(Date:10/12/2017)... ... October 12, 2017 , ... DuPont Pioneer ... that they have entered into a multiyear collaboration to identify and characterize novel ... additional tools for gene editing across all applications. , Under the terms of ...
(Date:10/12/2017)... ... 2017 , ... AMRI, a global contract research, development and ... outcomes and quality of life, will now be offering its impurity solutions as ... regulatory requirements for all new drug products, including the finalization of ICH M7 ...
(Date:10/11/2017)... ... October 11, 2017 , ... ... in its endogenous context, enabling overexpression experiments and avoiding the use of exogenous ... RNA guides is transformative for performing systematic gain-of-function studies. , This complement ...
(Date:10/11/2017)... ... October 11, 2017 , ... Proscia Inc ... hosting a Webinar titled, “Pathology is going digital. Is your lab ready?” with ... adoption best practices and how Proscia improves lab economics and realizes an increase ...
Breaking Biology Technology:
Cached News: