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|Authors: ||Scognamiglio, L.*|
|Title: ||Near real time regional moment tensor estimation using italian broadband stations|
|Issue Date: ||10-Dec-2006|
|Keywords: ||real time moment tensor|
|Abstract: ||Since 2002, the Istituto Nazionale di Geofisica e Vulcanologia (INGV) in Rome has started the installation of a high quality
regional broadband network throughout the Italian territory. Up today, the network consists of 125 stations equipped with 40 s
natural period instruments. The dense station coverage allows for the implementation of real-time regional moment tensor (MT)
estimation procedures such as that proposed by Dreger and Helmberger (1993).
The automatic MT algorithm uses real-time broadband waveforms continuously telemetered to INGV, and it is triggered for events
with magnitude greater than Ml 3.5. This is the lowermost value for which we have found it possible to obtain reliable MT determination
in the frequency band used in the inversion. The automatic solution is available within about 3-5 minutes after the earthquake
location. Each solution has an assigned quality factor dependent on the number of the station used in the inversion, and the godness
of fit between synthetic and observed data. MT is published on the web after revision by a seismologist.
Efforts are also made to evaluate MT solutions for earthquakes occurring in Italy and neighboring regions in the last years. The
results are compared to those obtained from application of other moment tensor methods. It is always found a good agreement
between the newly determined solutions and those from other methods.
Overall, fast and accurate moment tensor solutions are an important ingredient when attempting to estimate the recorded ground
shaking. Overall, in Italy, earthquakes in the magnitude range 3.5 – 5 are very common; the availability of their focal mechanisms
allows the mapping of the principal stress field axes leading to a better understanding of the ongoing tectonics.|
|Appears in Collections:||Conference materials|
04.06.99. General or miscellaneous
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