HR: 14:15h
AN: S33C-02    [Abstracts]
TI: New Perpectives at MedNet
AU: * Mazza, S
EM: mazza@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Rome, 00143, Italy
AU: Olivieri, M
EM: olivieri@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Rome, 00143, Italy
AU: Mandiello, A
EM: mandiello@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Rome, 00143, Italy
AU: Scognamiglio, L
EM: scognamiglio@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Rome, 00143, Italy
AU: Pondrelli, S
EM: pondrelli@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Rome, 00143, Italy
AU: Amato, A
EM: amato@ingv.it
AF: Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata, 605, Rome, 00143, Italy
AB: MedNet (Mediterranean Network) is a network of very broad band seismic stations installed in countries surrounding the Mediterranean Sea. The project started in 1987, with the aim of providing high quality real-time data to the comprehension of one of the most active seismic regions of the World. Its main objectives were mapping the structure of the Mediterranean region, studying the seismic source properties of intermediate and large events, and applying this knowledge to measures for hazard mitigation and civil protection. Although general goals still hold, the network has now a different valence in the Euro-Mediterranean seismological landscape. National networks are now equipped with similar high quality instrumentation, real time transmission is adopted everywhere for seismic monitoring and infrastructures can support high rate data exchange among networks. MedNet objectives have then shifted toward contributing to real time monitoring of the Euro-Med region. The network presently comprises 22 operating seismic stations installed and maintained in cooperation with 13 geophysical institutions in Italy and in most of the Euro-Mediterranean. All the stations are equipped with 24-bit digitizers and very broad band sensors (Streckeisen STS2, with a few STS1). The MedNet Data Center (MNDC) exchanges data in real time with many seismological observatories, as well as ORFEUS and IRIS DMS. Over 15 years of archived very broad band data are distributed at users request by standard NetDC and AutoDRM protocols (in SEED and GSE formats respectively). Within the EC Project NERIES, MNDC hosts the European Integrated Data Archive, providing support and/or backup to the partner institutions. Presently, fully automatic network functions include: i)daily monitoring of state of health; ii) data recover after link failures; iii) triggered retrieval of event waveforms (with magnitude- and region- specific selection criteria) from continuous; iv) web pages update (http:mednet.ingv.it) for events and station information. Two different techniques for rapid semiautomatic moment tensor solutions are running at MedNet. The first one makes use of the Regional CMT routines (Arvidsson & Ekström, 1998). The procedure is very stable, but the human intervention is essential. The second procedure, as proposed by Dreger & Romanowicz (1994), yields a first unmanned solution, then a successive solution revised by a seismologist. This second approach uses higher frequencies, in order to lower the Mw threshold for which moments are estimated in areas with proper station coverage. In the framework of IOC initiative on "North East Atlantic, Mediterranean and connected seas Tsunami Warning System" (NEAMTWS), INGV is developing a Regional Center for a tsunami watch in the Mediterranean. In this regard, different systems are under test to locate earthquakes in the Euro-Med region, taking advantage of the stations available from the Virtual European Broadband Seismograph Network (VEBSN) and from national networks.
DE: 7215 Earthquake source observations (1240)
DE: 7294 Seismic instruments and networks (0935, 3025)
SC: Seismology [S]
MN: 2007 Joint Assembly