Three-dimensional earthquake locations and upper crustal structure of the Sannio-Matese region (southern Italy) |
| |
Authors: | Loredana Bisio Rita Di Giovambattista Girolamo Milano Claudio Chiarabba |
| |
Affiliation: | aIstituto Nazionale di Geofisica e Vulcanologia, via di Vignia Murata 605 Rome 00143, Italy;bOsservatorio Vesuviano, Istituto Nazionale di Geofisica e Vulcanologia, Naples, Italy |
| |
Abstract: | The Sannio-Matese region is one of the most seismically active regions of Italy and has been struck by large historical earthquakes. At present, the area is characterized by low magnitude background seismicity and small seismic sequences following M4 main events. In this paper, we show Vp and Vp/Vs models and 3D locations for a complete set of earthquakes occurring in the period 1991–2001. We observe a significant crustal heterogeneity, with large scale east-verging high Vp fault-related-folds, stacked by the Pliocene compression. The relocated earthquakes cluster along a 70° east-dipping, NW-striking plane located at the border of the high Vp thrust units. Normal fault earthquakes related to the young and active extension occur within these high Vp zones, interpreted as high strength material. We expect large future earthquakes to occur within these high Vp zones actually characterized by low magnitude seismicity at their borders. |
| |
Keywords: | Seismic tomography Seismotectonic Southern Apennines Crustal model |
本文献已被 ScienceDirect 等数据库收录! |
|