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Authors: | Basili, R.* Meghraoui, M.* |
Title: | Coseismic and postseismic displacements related with the 1997 earthquake sequence in Umbria-Marche (central Italy) | Journal: | Geophysical Research Letters | Series/Report no.: | 14/28 (2001) | Publisher: | American Geophysical Union | Issue Date: | Feb-2001 | DOI: | 10.1029/2000GL012102 | URL: | http://www.agu.org/pubs/crossref/2001/2000GL012102.shtml | Keywords: | Coseismic displacement postseismic displacement earthquake fault Colfiorito, Italy |
Subject Classification: | 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations 04. Solid Earth::04.04. Geology::04.04.01. Earthquake geology and paleoseismology 04. Solid Earth::04.04. Geology::04.04.09. Structural geology 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics |
Abstract: | We study the coseismic and postseismic displacements related with the 1997 Umbria-Marche earthquake sequence by means of leveling lines along a deformed aqueduct located in the epicentral area. Comparing the 1960 and 10/1997 measurements we obtain 0.49 0.10 m of coseismic displacement distributed along 3 km across the normal fault zone. Modeling of the coseismic surface dislocation is obtained from a combination of low angle (38°) faults at depth and high angle (80°) upper fault branches. The best fit model indicates that the upper branches stop at 0.4 km below the ground surface and have 60% of slip with respect to the lower faults. The postseismic displacement measured during 1998 is 0.18 m and represents 36% of the apparent coseismic deformation. Moderate earthquakes in the Apennines and related surface deformation may thus result from curved faults that reflect the brittle-elastic properties of the uppermost crustal structures. |
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