Journal of Geophysical Research – Solid Earth
Supporting Information for
Seismogenic Strain Across The Transition from Forearc Slivering to Collision in
Southern Taiwan
Jonathan C. Lewis
Daniel J. O’Hara*
Department of Geoscience, Indiana University of Pennsylvania, Indiana, PA, USA
* currently at Department of Geological Sciences, University of Oregon, Eugene, OR,
USA
Ruey-Juin Rau
Department of Earth Sciences, National Cheng Kung University, Tainan City, Taiwan,
ROC
Contents of this file
Caption for Table S1
Caption for Figure S1
Introduction. Table S1 is a listing of the 251 earthquake focal mechanisms used for strain
inversions. These events are from the catalog compiled by Ruey-Juin Rau and processed
as per Rau et al. [2012], incorporating first-motion with amplitude ratios and CMT
solutions** for earthquakes with ML > 3.5. A total of 515 focal mechanisms for small-tomoderate-sized events (3.5  ML  6.4) in southeastern Taiwan between April 1991 and
February 2010 were obtained in the present study. Only the 251 events from depths of 030 km were used in our inversions for the eastern portion of the study area and from
depths of 15-25 km for the eastern portion of the study area. Figure S1 shows the
earthquake focal mechanisms on an 11-inch by 17-inch map.
Table S1. The first column contains the name of the tectonic segment as discussed in the
text. The last two segments come from the CMT catalog** and are cited below and at the
end of the table. Strike is given as an azimuth from 0-360° clockwise from north, dip as
an angle from 0-90° measured from horizontal, and rake is provided as an angle
measured relative to nodal plane strike, ±180°.
1
Rau, R.-J., Lee, J.-C., Ching, K.-E., Lee, Y.-H., Byrne, T.B. and Chen, R.-Y. (2012),
Subduction-continent collision in southwestern Taiwan and the 2010 Jiashian
earthquake sequence, Tectonophysics, 578, 107-116,
doi:10.1016/j.tecto.2011.09.013.
** global moment tensor catalog (citations below)
Dziewonski, A. M., T.-A. Chou, and J. H. Woodhouse (1981), Determination of
earthquake source parameters from waveform data for studies of global and regional
seismicity, Journal Geophysical Research, 86, 2825-2852,
doi:10.1029/JB086iB04p02825
Ekström, G., M. Nettles, and A. M. Dziewonski (2012), The global CMT project 20042010: Centroid-moment tensors for 13,017 earthquakes, Phys. Earth Planet. Inter.,
200-201, 1-9, doi:10.1016/j.pepi.2012.04.002
Figure S1. Latitude and longitude map frame showing the 251 earthquake focal
mechanisms plotted as equal-area, lower-hemisphere stereonets (color coded by depth as
indicated).
2