Imperial College London
Alternate

Professor Julian J Bommer

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Research Investigator
 
 
 
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Contact

 

+44 (0)20 7594 5984j.bommer Website CV

 
 
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Location

 

Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Dost:2018:10.1785/02201700247,
author = {Dost, B and Edwards, B and Bommer, JJ},
doi = {10.1785/02201700247},
journal = {Seismological Research Letters},
pages = {1062--1074},
title = {The relationship between M and M<inf>L</inf>: A review and application to induced seismicity in the groningen gas field, the Netherlands},
url = {http://dx.doi.org/10.1785/02201700247},
volume = {89},
year = {2018}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The use of local magnitude (M L ) in seismic hazard analyses is a topic of recent debate. In regions of weak or moderate seismicity, small earthquakes (characterized by M L ) are commonly used to determine frequency-magnitude distributions (FMDs) for probabilistic seismic hazard calculations. However, empirical and theoretical studies on the relation between moment magnitude (M) and M L for small earthquakes show a systematic difference between the two below a region-dependent magnitude threshold. This difference may introduce bias in the estimation of the frequency of larger events with given M, and consequently seismic hazard. For induced seismicity related to the Groningen gas field, this magnitude threshold is determined to be M ∼ 2, with equality between M and M L at higher magnitudes. A quadratic relation between M and M L is derived for 0:5  <  M L <  2, in correspondence to recent theoretical studies. Although the seismic hazard analysis for Groningen is internally consistent when expressed in terms of M L (with the implicit assumption of equivalence between the two scales), a more physical interpretation of the seismicity model requires transformation of the earthquake catalog from local to moment magnitude, especially because the dataset currently used in estimating time-dependent hazard consists mainly of M L <  2:5 events. We show that measured station effects, derived from M calculations, correspond to predicted model calculations used to determine a ground-motion model for the region.
AU  - Dost,B
AU  - Edwards,B
AU  - Bommer,JJ
DO  - 10.1785/02201700247
EP  - 1074
PY  - 2018///
SN  - 0895-0695
SP  - 1062
TI  - The relationship between M and M<inf>L</inf>: A review and application to induced seismicity in the groningen gas field, the Netherlands
T2  - Seismological Research Letters
UR  - http://dx.doi.org/10.1785/02201700247
UR  - http://hdl.handle.net/10044/1/60435
VL  - 89
ER  -
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