Publication Date:
2014-01-25
Description:
The extent to which ongoing seismicity in intraplate regions represents long-lived aftershock activity is unclear. We examined historical and instrumental seismicity in the New Madrid central U.S. region to determine whether present-day seismicity is composed predominantly of aftershocks of the 1811-1812 earthquake sequence. High aftershock productivity is required both to match the observation of multiple mainshocks and to explain the modern level of activity as aftershocks; synthetic sequences consistent with these observations substantially overpredict the number of events of magnitude 〉/= 6 that were observed in the past 200 years. Our results imply that ongoing background seismicity in the New Madrid region is driven by ongoing strain accrual processes and that, despite low deformation rates, seismic activity in the zone is not decaying with time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Page, Morgan T -- Hough, Susan E -- New York, N.Y. -- Science. 2014 Feb 14;343(6172):762-4. doi: 10.1126/science.1248215. Epub 2014 Jan 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U.S. Geological Survey, Pasadena, CA, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24457216" target="_blank"〉PubMed〈/a〉
Keywords:
*Disaster Planning/history
;
*Earthquakes/history
;
History, 19th Century
;
Midwestern United States
;
Time Factors
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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