A Pragmatic Approach to Seismic Parameters in a region with Low Seismicity: The Case of Eastern Iberia |
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| Authors: | H Perea E Masana P Santanach |
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| Institution: | (1) Departament de Geodinàmica i Geofísica, Facultat de Geologia, Universitat de Barcelona, C/Martí Franquès s/n, 08028 Barcelona, Spain |
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| Abstract: | In intra-plate regions with low-seismic activity, seismic cycles last between 103 and 105 years and, consequently, quiescent faults may be capable of producing catastrophic earthquakes. Paleoseismic studies, which
are necessary to define capable faults in these regions and to establish their seismic parameters, are scarce and not always
possible. In order to overcome the scarcity of paleoseismic data, this paper proposes an approach to evaluate the capability
and seismic parameters of faults. This approach takes into account instrumental, historical, paleoseismological and geological
data. Assuming that in a given structural region with definite climatic and geological characteristics similar geomorphic
features reflect a similar structural-seismic evolution, the capability of faults is established by comparing the fault related
geomorphic features of the few proven seismogenic faults with those of the rest of the faults. The seismic parameters were
estimated using some mathematical relationships from geological and geomorphological data, where the slip rate of the faults
was determined from geological and geomorphological criteria. The case of eastern Iberia is presented to illustrate this approach.
This area is characterized by low seismicity, few historical destructive earthquakes, and only one fault with good paleoseismological
data. Of the 249 potential faults (longer than 10 km and adequately oriented with respect to the current stress field), 23
were regarded as capable faults. Some of these were located in seismic quiescent areas, and their main seismic parameters
were estimated. |
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| Keywords: | capable faults seismogenic faults active tectonics geomorphology paleoseismology fault seismic parameters eastern Iberia intra-plate regions |
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