Electronic Supplement to
Rupture Directivity of the 18 April 2008 Mt. Carmel, Illinois, Earthquake from Modeling of Local Seismic Waveforms

by Xiaohui He, Zhongwen Zhan, Peizhen Zhang, and Dongli Zhang

This electronic supplement includes three tables and one figure to explain the velocity model, an illustration of the relative centroid-location method, and the rupture directivity estimation results.


Tables

Table S1. The central U.S. (CUS) velocity model (Herrmann, 1979).

Table S2. The rupture directivity estimation result for the forward test.

Table S3. The rupture directivity estimation result with Love waves for the bilateral rupture test.


Figure

Figure S1. A schematic map of the relative centroid-location method. The mainshock (M) ruptures from the hypocenter (Mh) toward the centroid (Mc). For the reference event (A), the hypocenter (Ah) and centroid (Ac) are very close to each other. The reference event is used as a path calibration to suppress the effect of velocity anomaly.


Reference

Herrmann, R. B. (1979). Surface wave focal mechanisms for eastern North American earthquake with tectonic implications, J. Geophys. Res. 84, 3543–3552.

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