TY  - CHAP
N1  - Congress held April 25-30, 2010, in Bali, Indonesia
ID  - epos1785
UR  - https://www.geothermal-library.org/index.php?mode=pubs&action=view&record=8006664
A1  - Mukuhira, Yusuke
A1  - Nozaki, Hyuma
A1  - Asanuma, Hiroshi
A1  - Niitsuma, Hiroaki
A1  - Wyborn, D.
A1  - Häring, Markus O.
Y1  - 2010///
N2  - 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.
PB  - International Geothermal Association
KW  - HDR/EGS
KW  -  microseismicity
KW  -  stimulation
KW  - 
magnitude
KW  -  Cooper Basin
KW  -  Basel
TI  - Interpretation of Microseismic Events of Large Magnitudes Collected at Cooper Basin, Australia and at Basel, Switzerland
AV  - none
T2  - Proceedings World Geothermal Congress 2010
ER  -