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shear faulting

Shear faulting

Radiation pattern of shear-tensile faults on Matlab File Exchange

While writing a paper to Journal of Geophysical Research on S-to-P radiated energy ratio from shear-tensile events I created a number of MATLAB functions related to the methodology presented inside. One of the routines, rpgen.m, I just uploaded to MATLAB file exchange. This function calculates P, S, SH and SV radiation pattern from shear-tensile fault at certain takeoff angle and azimuth of observation. The fault itself is parameterized by strike, dip, rake, tensile angle and Poisson’s ratio.

Link: RPGEN.M – Matlab File Exchange.

JGR Paper: Assessment of S/P radiated energy ratio from shear-tensile picoearthquakes

Together with Yehuda Ben-Zion we published a paper in Journal of Geophysical Research. The paper is entitled “Assessment of P and S wave energy radiated from very small shear-tensile seismic events in a deep South African mine“. The publication is my come-back to the JAGUARS project that we worked on between 2007 and 2011 and analyzed nano- and picoseismicity recorded in Mponeng deep gold mine in South Africa.

In the study we discuss requirements for reliable estimates of radiated seismic energy in S and P phases and derive ratios of S-to-P radiated energy of over 500 extremely small seismic events with local magnitudes −5.23 ≤ ML ≤ −2.41 (subdecimeter size) recorded by high-frequency acoustic emission (AE) sensors of the JAGUARS seismic network in the Mponeng deep gold mine, South Africa. Please see the article page for details.

Reference: Kwiatek, G. and Y. Ben-Zion (2013). Assessment of P and S wave energy radiated from very small shear-tensile seismic events in a deep South African mine. J. Geophys. Res. 118, DOI: 10.1002/jgrb.50274.