Maximum magnitude estimation considering the regional rupture character

Anbazhagan, P and Bajaj, Ketan and Moustafa, Sayed SR and Al-Arifi, Nassir SN (2015) Maximum magnitude estimation considering the regional rupture character. In: JOURNAL OF SEISMOLOGY, 19 (3). pp. 695-719.

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Abstract

The main objective of the paper is to develop a new method to estimate the maximum magnitude (M (max)) considering the regional rupture character. The proposed method has been explained in detail and examined for both intraplate and active regions. Seismotectonic data has been collected for both the regions, and seismic study area (SSA) map was generated for radii of 150, 300, and 500 km. The regional rupture character was established by considering percentage fault rupture (PFR), which is the ratio of subsurface rupture length (RLD) to total fault length (TFL). PFR is used to arrive RLD and is further used for the estimation of maximum magnitude for each seismic source. Maximum magnitude for both the regions was estimated and compared with the existing methods for determining M (max) values. The proposed method gives similar M (max) value irrespective of SSA radius and seismicity. Further seismicity parameters such as magnitude of completeness (M (c) ), ``a'' and ``aEuro parts per thousand b `` parameters and maximum observed magnitude (M (max) (obs) ) were determined for each SSA and used to estimate M (max) by considering all the existing methods. It is observed from the study that existing deterministic and probabilistic M (max) estimation methods are sensitive to SSA radius, M (c) , a and b parameters and M (max) (obs) values. However, M (max) determined from the proposed method is a function of rupture character instead of the seismicity parameters. It was also observed that intraplate region has less PFR when compared to active seismic region.

Item Type:	Journal Article
Publication:	JOURNAL OF SEISMOLOGY
Publisher:	SPRINGER
Additional Information:	Copy right for this article belongs to the SPRINGER, VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
Keywords:	Maximum earthquake magnitude (M-max); Regional rupture characteristics; ``a'' and ``b'' G-R parameters; Magnitude of completeness; Maximum observed magnitude (M-max(obs))
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	06 Jul 2015 06:52
Last Modified:	06 Jul 2015 06:52
URI:	http://eprints.iisc.ac.in/id/eprint/51807

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