MedNet: the very broad-band seismic network for the Mediterranean

1991 ◽  
Vol 14 (1) ◽  
pp. 79-99 ◽  
Author(s):  
E. Boschi ◽  
D. Giardini ◽  
A. Morelli
Keyword(s):  
Broad Band ◽  
Seismic Network ◽  
The Mediterranean

scholarly journals Crustal structure beneath broad-band seismic stations in the Mediterranean region

2003 ◽  
Vol 152 (3) ◽  
pp. 729-739 ◽  
Author(s):  
Mark van der Meijde ◽  
Suzan van der Lee ◽  
Domenico Giardini
Keyword(s):  
Crustal Structure ◽  
Mediterranean Region ◽  
Broad Band ◽  
Seismic Stations ◽  
The Mediterranean

scholarly journals OGS improvements in 2012 in running the North-eastern Italy Seismic Network: the Ferrara VBB borehole seismic station

2014 ◽  
Vol 36 ◽  
pp. 61-67
Author(s):  
D. Pesaresi ◽  
M. Romanelli ◽  
C. Barnaba ◽  
P. L. Bragato ◽  
G. Durì
Keyword(s):  
Real Time ◽  
Seismic Station ◽  
Broad Band ◽  
Seismic Monitoring ◽  
Seismic Network ◽  
Research Centre ◽  
Seismic Stations ◽  
The North ◽  
North Eastern ◽  
Borehole Seismic

Abstract. The Centro di Ricerche Sismologiche (CRS, Seismological Research Centre) of the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS, Italian National Institute for Oceanography and Experimental Geophysics) in Udine (Italy) after the strong earthquake of magnitude M=6.4 occurred in 1976 in the Italian Friuli-Venezia Giulia region, started to operate the North-eastern Italy Seismic Network: it currently consists of 17 very sensitive broad band and 18 simpler short period seismic stations, all telemetered to and acquired in real time at the OGS-CRS data centre in Udine. Real time data exchange agreements in place with other Italian, Slovenian, Austrian and Swiss seismological institutes lead to a total number of about 100 seismic stations acquired in real time, which makes the OGS the reference institute for seismic monitoring of North-eastern Italy. The south-western edge of the OGS seismic network (Fig. 1) stands on the Po alluvial basin: earthquake localization and characterization in this area is affected by the presence of soft alluvial deposits. OGS ha already experience in running a local seismic network in high noise conditions making use of borehole installations in the case of the micro-seismicity monitoring of a local gas storage site for a private company. Following the ML = 5.9 earthquake that struck the Emilia region around Ferrara in Northern Italy on 20 May 2012 at 02:03:53 UTC, a cooperation of Istituto Nazionale di Geofisica e Vulcanologia, OGS, the Comune di Ferrara and the University of Ferrara lead to the reinstallation of a previously existing very broad band (VBB) borehole seismic station in Ferrara. The aim of the OGS intervention was on one hand to extend its real time seismic monitoring capabilities toward South-West, including Ferrara and its surroundings, and on the other hand to evaluate the seismic response at the site. We will describe improvements in running the North-eastern Italy Seismic Network, including details of the Ferrara VBB borehole station configuration and installation, with first results.

SKS splitting observed at Romanian broad-band seismic network

2008 ◽  
Vol 462 (1-4) ◽  
pp. 89-98 ◽  
Author(s):  
Marian Ivan ◽  
Mihaela Popa ◽  
Daniela Ghica
Keyword(s):  
Broad Band ◽  
Seismic Network ◽  
Sks Splitting

scholarly journals Automatic moment tensor determination for the Hellenic Unified Seismic Network.

2016 ◽  
Vol 47 (3) ◽  
pp. 1308
Author(s):  
N. Triantafyllis ◽  
E. Sokos ◽  
A. Ilias
Keyword(s):  
Real Time ◽  
Seismic Station ◽  
Moment Tensor ◽  
Broad Band ◽  
Seismic Network ◽  
Global Networks ◽  
First Case ◽  
Inversion Procedure ◽  
Using Data ◽  
Seismic Networks

Modern seismic networks with broadband sensors and real time digital telemetry made Moment Tensor (MT) determination a routine procedure. Automatic MT’s are now provided by global networks and a few very dense regional networks, within minutes after a significant event. An automatic MT determination wasn’t possible for the broader Hellenic area since seismic station density wasn’t sufficient. The creation of the Hellenic Unified Seismic Network (HUSN) provided the opportunity to apply an automated MT procedure using the available broad band data from almost    one hundred stations. Thus the ISOLA code was extended towards the automatic operation based on Linux OS shell scripts, stand alone Fortran codes and SAC2000. Software supports both manual and automatic mode; at the first case, the user manually runs the program with the desired input parameters while at the latter, the system monitors a mailbox or RSS feed and if it receives an appropriate notification triggers the MT inversion procedure based on certain conditions. As it is setup now it calculates automatically the moment tensor of earthquakes larger than 3.5M  w using data from HUSN. Application of an automated MT inversion procedure for HUSN will provide important real time information for studies like ground motion evaluation, tsunami warning etc.

scholarly journals A seismological study of landquakes using a real-time broad-band seismic network

2013 ◽  
Vol 194 (2) ◽  
pp. 885-898 ◽  
Author(s):  
Chi-Hsuan Chen ◽  
Wei-An Chao ◽  
Yih-Min Wu ◽  
Li Zhao ◽  
Yue-Gau Chen ◽  
...  
Keyword(s):  
Real Time ◽  
Broad Band ◽  
Seismic Network

scholarly journals Planning the improvement of a seismic network for monitoring active volcanic areas: the experience on Mt. Etna

2013 ◽  
Vol 36 ◽  
pp. 39-47 ◽  
Author(s):  
A. D'Alessandro ◽  
L. Scarfì ◽  
A. Scaltrito ◽  
S. Di Prima ◽  
S. Rapisarda
Keyword(s):  
Broad Band ◽  
Careful Analysis ◽  
Parameters Estimation ◽  
Seismic Network ◽  
Diagnostic Tools ◽  
Volcanic Area ◽  
Highly Active ◽  
Short Period ◽  
Before And After ◽  
Mt Etna

Abstract. Seismology and geodesy are generally seen as the most reliable diagnostic tools for monitoring highly active or erupting volcanoes, like Mt. Etna. From the early 1980's, seismic activity was monitored at Mt. Etna by a permanent seismic network, progressively improved in the following years. This network has been considerably enhanced since 2005 by 24-bit digital stations equipped with broad-band (40 s) sensors. Today, thanks to a configuration of 33 broad-band and 12 short-period stations, we have a good coverage of the volcanic area as well as a high quality of the collected data. In the framework of the VULCAMED project a workgroup of Istituto Nazionale di Geofisica e Vulcanologia has taken on the task of developing the seismic monitoring system, through the installation of other seismic stations. The choice of optimal sites must be clearly made through a careful analysis of the geometry of the existing seismic network. In this paper, we applied the Seismic Network Evaluation through Simulation in order to evaluate the performance of the Etna Seismic Network before and after the addition of the stations in the candidate sites. The main advantage of the adopted method is that we can evaluate the improvement of the network before the actual installation of the stations. Our analysis has permitted to identify some critical issues of the current permanent seismic network related to the lack of stations in the southern sector of the volcano, which is nevertheless affected by a number of seismogenic structures. We have showed that the addition of stations at the candidate sites would greatly extend the coverage of the network to the south by significantly reducing the errors in the hypocenter parameters estimation.

scholarly journals OGS improvements in the year 2011 in running the Northeastern Italy Seismic Network

2013 ◽  
Vol 34 ◽  
pp. 5-8 ◽  
Author(s):  
P. L. Bragato ◽  
D. Pesaresi ◽  
A. Saraò ◽  
P. Di Bartolomeo ◽  
G. Durì
Keyword(s):  
Real Time ◽  
Data Exchange ◽  
Broad Band ◽  
Main Tool ◽  
Seismic Network ◽  
Time Data ◽  
Seismic Stations ◽  
Short Period ◽  
Real Time Data ◽  
Northeastern Italy

Abstract. The Centro di Ricerche Sismologiche (CRS, Seismological Research Center) of the Istituto Nazionale di Oceanografia e di Geofisica Sperimentale - OGS (Italian National Institute for Oceanography and Experimental Geophysics) in Udine (Italy) after the strong earthquake of magnitude Mw = 6.4 occurred in 1976 in the Italian Friuli-Venezia Giulia region, started to operate the Northeastern Italy Seismic Network: it currently consists of 12 very sensitive broad band and 21 simpler short period seismic stations, all telemetered to and acquired in real time at the OGS-CRS data centre in Udine. Real time data exchange agreements in place with other Italian, Slovenian, Austrian and Swiss seismological institutes lead to a total number of 93 seismic stations acquired in real time, which makes the OGS the reference institute for seismic monitoring of Northeastern Italy, as shown in Fig. 1 (Bragato et al., 2011; Saraò et al., 2010). Since 2002 OGS-CRS is using the Antelope software suite as the main tool for collecting, analyzing, archiving and exchanging seismic data, initially in the framework of the EU Interreg IIIA project "Trans-national seismological networks in the South-Eastern Alps" (Bragato et al., 2010; Pesaresi et al., 2008). SeisComP is also used as a real time data exchange server tool. In order to improve the seismological monitoring of the Northeastern Italy area, at OGS-CRS we tuned existing programs and created ad hoc ones like: a customized web server named PickServer to manually relocate earthquakes, a script for automatic moment tensor determination, scripts for web publishing of earthquake parametric data, waveforms, state of health parameters and shaking maps, noise characterization by means of automatic spectra analysis, and last but not least scripts for email/SMS/fax alerting. A new OGS-CRS real time seismological website (http://rts.crs.inogs.it/) has also been operative since several years.

scholarly journals Local magnitude estimation in Greece, based on recordings of the Hellenic Unified Seismic Network (HUSN).

2016 ◽  
Vol 47 (3) ◽  
pp. 1241
Author(s):  
E. Scordilis ◽  
D. Kementzetzidou ◽  
B. Papazachos
Keyword(s):  
Magnitude Estimation ◽  
Broad Band ◽  
Seismic Network ◽  
Estimation Accuracy ◽  
Geometrical Spreading ◽  
Spreading Factor ◽  
Anelastic Attenuation ◽  
Accuracy Comparison ◽  
The University ◽  
Range Of Values

A new relation is proposed for calculation of local magnitudes in Greece. For this purpose, there were used synthetic Wood-Anderson (SWA) recordings of 98 digital broad-band stations operating between 2007 and 2011. These stations are installed at the sites of the seismological networks of: a) the National Observatory of Athens(HL), b) the Department of Geophysics of the Aristotle University of Thessaloniki (HT), c) the Seismological Laboratory of the University of Athens (HA) and d) the Seismological Laboratory of the University of Patras (HP). All these institutions constitute the recently (2004) established Hellenic Unified Seismic Network (HUSN). These recordings are used to calculate a refined geometrical spreading factor and an anelastic attenuation coefficient, representative for Greece and surrounding area, proper for estimating local magnitudes in this region. Individual station corrections are also calculated in order to further ameliorate magnitude estimation accuracy. Comparison of such calculated local magnitudes with corresponding original moment magnitudes revealed that these two scales are equivalent for awide range of values (2.9≤MW≤6.4). 

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