| |
 |
UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-23 18:32 |
 |
|
|
|
Conference: Bucharest University Faculty of Physics 2017 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Moment magnitude estimation for the seismic swarm recorded in Petresti area in 2014, using strong motion data
Authors:
George Marius CRAIU (1), Andreea CRAIU (1), Anton DANET (1), Alexandru MARMUREANU(1), Cristian GHITA (1)
Affiliation:
1) National Institute for Earth Physics, Magurele, Romania
E-mail
cristi.ghita@infp.ro
Keywords:
moment magnitude, seismic moment, strong motion, focal mechanisms
Abstract:
A moderate-size earthquake with local magnitude 5.7 occurred on November 22, 2014, at 40 km depth, in Vrancea region. The event was followed by a burst of seismicity. The strongest aftershock (local magnitude 4.5) occurred on December 7, 2014, and a significant decrease of the activity was observed only after January 3, 2015. The occurrence of a 4.2 local magnitude earthquake on January 12, 2015 led to a new increase of the seismic activity, which lasted until around February 1, 2015. During the period November 22, 2014 - February 1, 2015, 271 events with local magnitude greater than 0.1 were located in the mainshock epicentral area. This crustal seismicity is related to the normal fault system associated to Peceneaga - Camena major fault, which separates the Focsani Basin, part of the Moesian Platform, from the North Dobrogea promontory. The recent upgrade of the seismic network in Romania with high dynamic range accelerometers (114 real time seismic stations equipped with episensors) allows recording of moderate to large magnitude earthquakes at very close epicentral distances (less than 10-20 km). A network for monitoring the strong motion that can occur in a given area records data that provide an excellent opportunity to study how source, path and site influence the ground motion, specifically that in the near-source area. The purpose of this work consists mainly in the estimation of moment magnitude Mw using the strong motion network of NIEP. The main goal is the independent estimation of seismic moment and corner frequency for all events recorded by the strong motion network.
Acknowledgement:
This paper was partially carried out within Nucleu Program, supported by ANCSI, projects no. PN 16 35 03 04, and PN 16 35 03 05.
Work was supported partially by 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.
|
|
|
|