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http://hdl.handle.net/2122/13157
Authors: | Gautier, S.* Latorre, Diana* Virieux, J.* Deschamps, A.* Skarpelos, C* Sotiriou, A* Serpetsidaki, A* Tselentis, A.* |
Title: | A New Passive Tomography of the Aigion Area (Gulf of Corinth, Greece) from the 2002 Data Set | Journal: | Pure and Applied Geophysics | Series/Report no.: | 2-3/163 (2006) | Issue Date: | 2006 | DOI: | 10.1007/s00024-005-0033-7 | Abstract: | We present the results of a tomographic study performed in the framework of the 3F-Corinth project. The aim of this work is to better understand the rifting process by imaging the crustal structure of the western Gulf of Corinth. Forty-nine stations were deployed for a period of six months, allowing us to monitor the microseismicity. Delayed P and S first-arrival times have been simultaneously inverted for both hypocenter locations and 3-D velocity distributions. We use an improved linearized tomography method based on an accurate finite-difference travel-time computation to invert the data set. The obtained Vp and Vs models confirm the presence of a two-layer vertical structure characterized by a sharp velocity gradient lying at 5–7 km depth, which may be interpreted as a lithological contrast. The shallower part of the crust (down to 5 km depth) is controlled by the N-S extension and lacks seismicity. The deeper part (7–13 km depth) matches the seismogenic zone and is characterized by faster and more heterogeneous anomalies. In this zone, the background seismicity reveals a low-angle active surface dipping about 20° toward the north and striking WNW-ESE. The position of this active structure is consistent with both high Vp/Vs and low Vp.Vs anomalies identified at 8–12 km depth and suggesting a highly fracturated and fluid-saturated zone. Both the geometry of the active structure beneath the gulf and the presence of fluids at 8–12 km depth are in accordance with a low-angle detachment model for the western part of the Gulf of Corinth. |
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