Seismic Studies

Goal: Deploy a passive 2D array and dense 1D transect of broadband instruments to resolve: a) the structure and nature of the Moho, 2) the location , internal structure, and strain field of the supra-slab asthenospheric wedge, and 3) the shape, extent, and structure of the subducting plate.

Members of the RETREAT Seismology Team (snapshot of an ever-expanding roster)

D. Piccinnini, N. Piana Agostinetti
- Istituto Nazionale di Geofisica e Vulcanologia, Arezzo, Italy
L. Margheriti, F.P. Lucente, A. Amato
- Istituto Nazionale di Geofisica e Vulcanologia, 00143 Rome, Italy
S. Pondrelli, L. Giovani
- Istituto Nazionale di Geofisica e Vulcanologia, 40133 Bologna, Italy
J. Park
- Yale University, Dept. of Geology and Geophysics, New Haven, CT 06520-8109, USA
V. Levin
- Rutgers University, Dept. of Geological Sciences, Piscataway, NJ, USA
J. Plomerova, P. Jedlicka, L. Vecsey, V. Babuska
- Geophysical Institute, Czech Academy of Sciences, 141 31 Prague 4, Czech Republic

Our Current Seismic Deployment in the northern Apennines -- a sparse 2-D network of broadband stations to survey the region

In October 2003 we installed 10 stations brought to Italy from the Geophysical Institute of the Czech Academy of Sciences. Each station consists of an STS2 broadband sensor, a GAIA digitizer (produced by GFU) that records on card flash, an SMS modem sending station state of health mssages, and a GPS antenna. Most of the stations were installed at sites of the Italian National Network currently occupied by short period instruments. We are collecting data from these stations (continuous recording at 20 Hz and triggers at 100 Hz) and, at the same time, from other 10 permanent stations (a broadband station from MedNet -20Hz; 5 satellite 30s stations and 4 digital 5s stations from the Italian National Network -100Hz).

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In October 2004, 25 IRIS PASSCAL broadband stations will be deployed in the Retreat Project along a line going from the Po Plain to Northern Tyrrhenian Sea (red stars on map). The stations will be equipped by RefTek digitizers and STS2 or CMG40 sensors.

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Click to expand.