Imperial College London
Alternate

Professor Julian J Bommer

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Research Investigator
 
 
 
//

Contact

 

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

 
 
//

Location

 

Skempton BuildingSouth Kensington Campus

//

Summary

 

Publications

Citation

BibTex format

@article{Bommer:2018:10.1785/0220170247,
author = {Bommer, JJ and Dost, B and Edwards, B},
doi = {10.1785/0220170247},
journal = {Seismological Research Letters},
title = {The relationship between M and ML – a review and application to induced seismicity in the Groningen gas field, the Netherlands},
url = {http://dx.doi.org/10.1785/0220170247},
year = {2018}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - The use  of  local  magnitude  (ML)  in  seismic  hazard  analyses  is  a  topic  of  recent  debate.  In 2regions  of  weak-or  moderate-seismicity,  small  earthquakes  (characterized  by  ML)  are 3commonly  used  to  determine  frequency-magnitude  distributions  (FMD)  for  probabilistic4seismic hazard  calculations.  However,  empirical  and  theoretical  studies  on  the  relation 5between   moment   magnitude   (M)   and   ML 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 Mand ML at higher magnitudes. A quadratic relation between M and ML is derived for 0.5 < ML < 2, in correspondence   to   recent   theoretical   studies.   While   the   seismic   hazard   analysis   for Groningen   is   internally   consistent   when   expressed   in   terms   of  ML (with  the  implicit assumption  of  equivalence  between  the  two  scales),  a  more  physical  interpretation  of  theseismicity model requirestransformation of the earthquake catalogue from local to moment magnitude, especially since the dataset currently used in estimating time-dependent hazard consists mainly of ML< 2.5 events. We show that measured station effects, derived from Mcalculations,  correspond  to  predicted  model  calculations  used  to  determine  a  ground-motion model for the region.
AU  - Bommer,JJ
AU  - Dost,B
AU  - Edwards,B
DO  - 10.1785/0220170247
PY  - 2018///
SN  - 0895-0695
TI  - The relationship between M and ML – a review and application to induced seismicity in the Groningen gas field, the Netherlands
T2  - Seismological Research Letters
UR  - http://dx.doi.org/10.1785/0220170247
UR  - http://hdl.handle.net/10044/1/57781
ER  -
Download