Coalescence Microseismic Mapping

Drew, J. and White, R. S. and Tilmann, F. J. and Tarasewicz, J. P. T. (2013) Coalescence Microseismic Mapping. Geophysical Journal International, 195 (3). pp. 1773-1785. ISSN 1365-246X DOI

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Earthquakes are commonly located by linearized inversion of discrete arrival time picks made from signals recorded at a network of seismic stations. If mis-picks are made, these will contribute to the location, therefore causing potential bias. For data recorded by a dense seismic array, direct imaging methods can be applied instead. We describe the ‘coalescence microseismic mapping’ method, which is a bridge between the two approaches and will operate with seismic data recorded continuously on a sparse array. By continuously mapping scalar signals derived from the envelope of seismic arrivals we derive robust estimates of the spatio-temporal coordinates of the origins of seismic events. Noisy data are migrated away from the correct origin, so do not contribute to errors in location. The method is rooted in a Bayesian formulation of event location traveltime inversion, allows imaging of source locations and has the capacity to handle errors in modelled traveltimes. It has the advantage of working with any 3-D velocity model, which therefore may include anisotropy. It also automatically incorporates both P- and S-wave data. A multiresolution grid search leads to an efficient implementation, with a search over a larger domain including joint inversion for location and velocity structure possible where warranted by the data quality. We discuss the theory and implementation of this method and illustrate it with real data from microseismic events in Iceland caused by melt intrusion in the crust.

Item Type: Article
Additional Information: © The Authors 2013. Published by Oxford University Press on behalf of The Royal Astronomical Society.All rights reserved.
Uncontrolled Keywords: 2013AREP; IA66,PhD.
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
07 - Gold Open Access
10 - Explosive Earth
Journal or Publication Title: Geophysical Journal International
Volume: 195
Page Range: pp. 1773-1785
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 12 Aug 2013 13:40
Last Modified: 22 Jun 2016 17:12

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