Focal mechanism solutions of certain earthquakes in Mizoram and its vicinity using P-wave first-motion data

DOI

10.2991/msc-18.2018.18How to use a DOI?

Keywords

Focal mechanism, earthquake, fault geometry, P-wave first-motion data

Abstract

Determination of focal mechanism solution permits characterization of the earthquake source most effectively with the estimation of fault geometry. Fault geometry is described in terms of the orientation of the fault plane and the direction of slip along the plane. However, the body wave, surface wave and the parameters such as equivalent forces at the source and seismic impulse response etc. are used to determine the orientation of fault plane and the direction of the movement associated with the earthquake. Since the majority of earthquake source processes are either complicated or cannot be observed directly, it has been necessary to find ways to determine source characteristics from seismic wave motion. The source mechanisms through P-wave first-motion data are determined by acquiring data from local seismic network supplemented by phases from the stations at teleseismic distances. Focal mechanism solutions for the events M>4.0 are well constrained. Although the uniform distribution of azimuth of a large number of stations is one of the important prerequisites for a reliable focal mechanism solution, this is not the case for the events (M<4.0) originated in NER. This situation worsens in the case of events M<3.0. Determinations of focal mechanisms for these events tend to near impossible with first motion P-wave arrival because very less number of stations record these events.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Saitluanga
PY  - 2018/12
DA  - 2018/12
TI  - Focal mechanism solutions of certain earthquakes in Mizoram and its vicinity using P-wave first-motion data
BT  - Proceedings of the Mizoram Science Congress 2018 (MSC 2018) - Perspective and Trends in the Development of Science Education and Research
PB  - Atlantis Press
SP  - 110
EP  - 115
SN  - 2352-5401
UR  - https://doi.org/10.2991/msc-18.2018.18
DO  - 10.2991/msc-18.2018.18
ID  - 2018/12
ER  -