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1DEPARTMENT OF MATHEMATICS, UNIVERSITY OF SAIGON, VIETNAM
2SEISMOLOGICAL LABORATORY, CALIFORNIA INSTITUTE OF TECHNOLOGY†
*
This work was supported by grant AF-AFOSR-26-63 of the U.S. Air Force Office of Scientific Research as part of the Advanced Research Projects Agency project VELA.
†
Contribution no. 1224, Division of Geological Sciences, California Institute of Technology.