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NEAR REAL TIME FOCAL MECHANISMS DETERMINATION FOR VRANCEA INTERMEDIATE DEPTH EVENTS
Abstract
One of the main objectives in real-time assessment of seismic hazard is the development of algorithms for rapid estimation of the seismic source parameters (fault planes solutions). The objective of this work is to test and implement new methodologies in the National Institute for Earth Physics (NIEP) for near real time estimation of fault planes solutions taking the advantage of the spatial density of the Seismic Network in seismically active zones ( 120 seismic stations used in real time) and the full range of tools used. To determine fault planes solutions was implemented the FPL code (code that generates parameters: strike, dip, rake, etc.) in ANTELOPE 5.6, software developed by Kinemetrics This code (FPL) uses the classic criteria to determine the focal mechanisms, namely P wave polarities, systematic tests of all possible fault plane solutions, so will validate only those solutions who met the required criteria. Another cod- Psmeca -is a code developed in GMT, which reads data values from files and generates PostScript code that will plot a focal mechanism on a map. These programs were implemented in the routine analysis ANTELOPE 5.6 software. Estimating the near-real-time fault planes solutions using dedicated programs, a few minutes after the event occurrence is done by generating locations of the seismic events with magnitude ML?4 for seismic events occurred at intermediate depths (H?60 km).
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References3
Snoke J.A., Munsey J.W., Teague A.G., Bollinger G.A., A programme for focal mechanism determination by combined use of polarity and SV-P amplitude ratio data, Earthquake Notes, 55,15, 1984.
Ottemöller L., Voss P. and Havskov J., SEISAN EARTHQUAKE ANALYSIS SOFTWARE FOR WINDOWS, SOLARIS, LINUX and MACOSX, 2016.
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