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Authors: Caporali, A.*
Barba, S.*
Carafa, M. M. C.*
Devoti, R.*
Pietrantonio, G.*
Riguzzi, F.*
Title: Static stress drop as determined from geodetic strain rates and statistical seismicity
Title of journal: Journal of Geophysical Researches
Publisher: AGU
Issue Date: 2010
DOI: 10.1029/2010JB007671
Keywords: earthquakes
seismic hazard
Abstract: Two critical items in the energetic budget of a seismic province are the strain rate, which is measured geodetically on the Earth’s surface, and the yearly number of earthquakes exceeding a given magnitude. Our study is based on one of the most complete and recent seismic catalogs of Italian earthquakes and on the strain rate map implied by a multi-year velocity solution for permanent GPS stations. For 36 homogeneous seismic zones, we used the appropriate Gutenberg Richter relation based on the seismicity catalog to estimate a seismic strain rate, which is the strain rate associated with the mechanical work due to a co-seismic displacement. The volume storing most of the elastic energy is associated with the long-term deformation of each seismic zone, and therefore, the seismic strain rate is inversely proportional to the static stress drop. The GPS-derived strain rate for each seismic zone limits the corresponding seismic strain rate, and an upper bound for the average stress drop is estimated. These results demonstrated that the implied regional static stress drop ranged from 0.1 to 5.7 MPa for catalog earthquakes in the moment magnitude range [4.5–7.3]. These results for stress drop are independent of the “a” and “b” regional parameters and heat flow but are very sensitive to the assumed maximum magnitude of a seismic province. The data do not rule out the hypothesis that the stress drop positively correlates with the time elapsed after the largest earthquake recorded in each seismic zone.
Description: Accepted for publication in Journal of Geophysical Researches. Copyright (2010) American Geophysical Union
Appears in Collections:04.04.06. Rheology, friction, and structure of fault zones
04.01.05. Rheology
04.01.02. Geological and geophysical evidences of deep processes
04.03.06. Measurements and monitoring
04.03.01. Crustal deformations
Papers Published / Papers in press

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