eprintid: 1785
rev_number: 17
eprint_status: archive
userid: 6
dir: disk0/00/00/17/85
datestamp: 2016-12-20 13:34:34
lastmod: 2019-02-06 10:46:26
status_changed: 2016-12-20 13:34:34
type: book_section
metadata_visibility: show
creators_name: Mukuhira, Yusuke
creators_name: Nozaki, Hyuma
creators_name: Asanuma, Hiroshi
creators_name: Niitsuma, Hiroaki
creators_name: Wyborn, D.
creators_name: Häring, Markus O.
corp_creators: Graduate School of Environmental Studies, Tohoku University, Japan
corp_creators: Graduate School of Environmental Studies, Tohoku University, Japan
corp_creators: Graduate School of Environmental Studies, Tohoku University, Japan
corp_creators: Graduate School of Environmental Studies, Tohoku University, Japan
corp_creators: Graduate School of Environmental Studies, Tohoku University, Japan
corp_creators: Graduate School of Environmental Studies, Tohoku University, Japan
title: Interpretation of Microseismic Events of Large Magnitudes Collected at Cooper Basin, Australia and at Basel, Switzerland
subjects: MP2
subjects: RA1
subjects: RS1
subjects: SG
divisions: SHEER-6
full_text_status: none
keywords: HDR/EGS, microseismicity, stimulation,
magnitude, Cooper Basin, Basel
note: Congress held April 25-30, 2010, in Bali, Indonesia
abstract: The authors analyzed microseismic events of large magnitudes collected during and after hydraulic stimulations at Cooper Basin, Australia in 2003 and at Basel, Switzerland in 2006. The characteristics of the large events and their
similarity/difference to the neighboring events were evaluated using hypocentral distribution and source radius, similarity of waveforms, fault plane solutions and volumetric strains induced by microseismic events.
It was found that some of the large events at Cooper Basin
brought clear extensions of the seismic cloud into previously
seismically silent zones suggesting that some kind of hydraulic barrier was broken by the large events. These events can be interpreted by single asperity slips in existing fractures. Meanwhile, it was revealed that most of the large events from the middle and deeper parts of the stimulated zone at Basel, where many hypocenters of other microseismic events can be seen, occurred as a result of the shear slip of multiple asperities. Shallow, large events at Basel whose hypocenters were estimated to be spatially independent from the seismic cloud, are very likely to occur in fractures sub-parallel to the stimulated zone. The mechanism of the large events is not universal and may depend on the site. The triggering mechanism of the large events remains unidentified.
date: 2010
date_type: published
publisher: International Geothermal Association
book_title: Proceedings World Geothermal Congress 2010
official_url: https://www.geothermal-library.org/index.php?mode=pubs&action=view&record=8006664
access_IS-EPOS: limited
owner: Publisher
citation:   Mukuhira, Yusuke and Nozaki, Hyuma and Asanuma, Hiroshi and Niitsuma, Hiroaki and Wyborn, D. and Häring, Markus O.  (2010) Interpretation of Microseismic Events of Large Magnitudes Collected at Cooper Basin, Australia and at Basel, Switzerland.   In:  Proceedings World Geothermal Congress 2010.   International Geothermal Association.