3 research outputs found
Regional earthquake magnitude conversion relations for the himalayan seismic belt
We present regional earthquake magnitude conversion relations among different magnitude
scales (Mw, Ms, mb, ML, and MD) for the Himalayan seismic belt developed from
data of local, regional, and international seismological agencies (International
Seismological Centre [ISC], National Earthquake Information Centre [NEIC], Global
Centroid Moment Tensor Solution [CMT], International Data Centre [IDC], China
Earthquake Administration [BJI], and National Centre for Seismology [NDI]). The intra-
(within the same magnitude scale) and inter- (with different magnitude scales) magnitude
regression relations have been established using the general orthogonal regression
and orthogonal distance regression techniques. Results show that the intramagnitude
relations for Mw, Ms, and mb reported by the Global CMT, ISC, and NEIC
exhibit 1:1 relationships, whereas ML reported by the IDC, BJI, and NDI deviates from
this relationship. The IDC underestimates Ms and mb compared with the ISC, NEIC, and
Global CMT; this may be due to different measurement procedures adopted by the IDC
agency. The inter-magnitude relations are established between Mw;GlobalCMT and Ms,
mb, and ML reported by the ISC, NEIC, IDC, and NDI, and compared with the previously
developed regional and global regression relations. The duration (MD) and local (ML)
magnitudes reported by NDI exhibit a 1:1 relationship. The derived magnitude regression
relations are expected to support the homogenization of the earthquake catalogs
and to improve seismic hazard assessment in this region