Frictional fusion due to coseismic landsliding during the 1999 Chi-Chi (Taiwan) ML 7.3 earthquake

Aiming Lin, Allen Chen, Ching Fei Liau, Chyi Tyi Lee, Chuan Chia Lin, Po Shen Lin, Shu Ching Wen, Toru Ouchi

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34 Scopus citations

Abstract

Fused materials (pseudotachylytes) generated from landsliding during the 1999 Chi-Chi (Taiwan) ML 7.3 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.

Original languageEnglish
Pages (from-to)4011-4014
Number of pages4
JournalGeophysical Research Letters
Volume28
Issue number20
DOIs
StatePublished - 15 Oct 2001

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