A New Seismic Moment Magnitude (Mwg) and Moment Magnitude (Mw): Common Root and Differences
Earthquake magnitude scale is one of the most fundamental earthquake source parameters to be used for measuring the strength of an earthquake. Several magnitude scales came into practice for estimating the size of an earthquake where as actual earthquake size remains mostly elusive for many obvious reasons. Mw scale mainly derived and validated for Southern Californian region. Hanks and Kanmori (1979) stated in the abstract Mw is uniformly valid >7.5. Moreover, Mw magnitude scale is defined from very long-period spectral amplitude and is not expected to correlate well with high-frequency ground motion for engineering importance. Therefore, on the basis of 25,708 global earthquake events, a new magnitude scale (Bulletin of Seismological Society of America: 109(4), pp. 1542–1555, August 2019) called seismic moment magnitude scale or Das Magnitude Scale (DMS) denoted by Mwg has been determined that closely connected to observe magnitudes scales such as mb, Ms, Me and radiated energy Es. This study will discuss in details about the common roots and differences between Mw and DMS scales (Mwg) and show the impact of incorrect use of Mw scale in earthquake engineering specially in developing seismicity parameters. Furthermore an Mwg based earthquake catalog with 39977 events for period 1516-2016 in magnitude range 1.7–8.8 has been be prepared for Northern Chile and Southern Peru with the help of developing regional scaling relationships between different magnitudes (mb, Ms, ML) and Mwg. The scaling relationships have been developed following recently suggested error corrected Orthogonal Regression methodology. The details of common roots and differences of the two scales will serve as a guideline for earthquake magnitude study. The prepared Mwg based unified catalog will serve a solid purpose for different seismological applications (e.g., Seismic Hazard Assessment, preparation of GMPE, Seismicity, Seismotectonics and Earthquake Prediction) for the study area.
Session: New Developments in Physics- and Statistics-based Earthquake Forecasting [Poster]
Type: Poster
Room: Evergreen Ballroom
Date: 4/22/2022
Presentation Time: 08:00 AM Pacific
Presenting Author: Ranjit Das
Student Presenter: No
Additional Authors
Ranjit Das Presenting Author Corresponding Author ranjit244614@gmail.com Universidad Catolica del Norte |
Claudio Meneses cmeneses@ucn.cl Universidad Catolida Del Norte |
Gabirel Gonzalez ggonzale@ucn.cl Universidad Catolica del Norte |
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A New Seismic Moment Magnitude (Mwg) and Moment Magnitude (Mw): Common Root and Differences
Category
New Developments in Physics- and Statistics-based Earthquake Forecasting
Description