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Project Author : Jiun-Ting Lin & D. Yeh
INTRODUCTION
Moment Tensor Inversion (CMT) method can be powerful to reveal the source mechanism, not only the earthquake, but also the explosive source. A typical CMT inversion could be presented by the following matrix form.
Where A is the Green's function with given a source, occurrence time and the rupture duration. M is the moment tensor matrix which represents the 6-linear independent moment tensor. Matrix d is the data which provided by IRIS data center (http://www.iris.edu/hq/).
DATA & INVERSION
The signal is obvious, with applying the weighted least-square method, the focal mechanism of this event can be well revealed.
The Least-square fitting (without weighted)
The weighted least-square solution
RESULTS
Distribution and covariance of the moment tensor (m1~m6)
Percentage of volume change (i.e. the isotropic term) = 51% of total moment.
CONCLUSION
Total moment released of 1.19*10^23 dyne-cm, equivalent to a moment magnitude of Mw4.65 earthquake. According to the percentage of 51% volume change, this event could be a typical explosive source.
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