Mathematics – Logic
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4011l&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 20, p. 4011-4014
Mathematics
Logic
7
Physical Properties Of Rocks, Seismology: Seismicity And Seismotectonics, Structural Geology
Scientific paper
Fused materials (pseudotachylytes) generated from landsliding during the 1999 Chi-Chi (Taiwan) ML7.3 earthquake are found on the glide plane in Mio-Pliocene interbedded shale and siltstone. The pseudotachylytes occur as thin layers on the glide plane and as veins injected into cracks in the host rocks, which are a few mm to 1 cm in thickness. Typical melting textures within the pseudotachylyte include vesicles, glassy matrices, flow structures, and rounded and embayed clast shapes. Powder X-ray diffraction analysis has revealed a glass content of up to 50 wt% within the pseudotachylyte. Physical conditions of pseudotachylyte formation are estimated to have been <1.5 MPa corresponding to ca. 40 m depth, at a temperature of at least 1100~1600°C. The geological and petrological data suggests that these pseudotachylytes formed by frictional melting generated from coseismic landsliding during the Chi-Chi earthquake.
Chen Allen
Lee Chyi-Tyi
Liau Ching-Fei
Lin Aiming
Lin Chuan-Chia
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