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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 17:54 |
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Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Near real time fault plane solution for Vrancea intermediate depth earthquakes
Authors:
Marius MIHAI (1), Andreea CRAIU (1), Anton DANET (1), Marius CRAIU (1), Alexandru MARMUREANU (1)
Affiliation:
1) National Institute for Earth Physics, Magurele, Romania
E-mail
nicu.mihai@infp.ro
Keywords:
fault plane solution, near real-time analysis, Vrancea area
Abstract:
The main objective of this paper is to test and implement a new algorithm developped at National Institute for Earth Physics (NIEP) for near real time fault plane solutions, taking the advantage of the spatial density of the National Seismic Network in active seismic zones and a large number of seismic sensors. The most important part of this study is dedicated to near real time fault plane solutions estimation, using dedicated software, a few minutes after the occurrence of an seismic event. The focal mechanism are determined after the event location with ML≥4 for the intermediate depth events (H≥60 km) and with ML≥3.5, for the crustal earthquakes (H<60 km).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 code - 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.We have made stable estimations in near real time of the focal mechanism (strike, dip, rake, etc.) for intermediate depth events and all this parameters are available in a short time (a few minutes after the event occurrence) and sent further to authorities, emergency and governamental institutions.
Acknowledgement:
The study was partly supported by the projects:
1.“Nucleu” of the National Plan for Research, Development and Innovation of the Romanian Ministry of National Education, Contract no. PN 16 35 03 05.
2.“Nucleu” of the National Plan for Research, Development and Innovation of the Romanian Ministry of National Education, Contract no. PN 16 35 03 04.
3.Grant of the Romanian National Authority for Scientific Research and Innovation, CNCS/CCCDI-UEFSCDI, project number PN-III-P2-2.1-PED-2016-1014, within PNCDI III.
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