Evidence of frictional melting from disk-shaped black material, discovered within the Taiwan Chelungpu fault system

Details Evidence of frictional melting from disk-shaped black material, discovered within the Taiwan Chelungpu fault system Evidence of frictional melting from disk-shaped black material, discovered within the Taiwan Chelungpu fault system

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3319311h&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 19, CiteID L19311

Physics

15

Seismology: Earthquake Dynamics (1242), Structural Geology: Fractures And Faults, Structural Geology: Rheology And Friction Of Fault Zones (8163)

Scientific paper

The Taiwan Chelungpu-fault Drilling Project penetrated three fault zones as the Chelungpu fault system, which slipped during the 1999 Chi-Chi earthquake, discovering disk-shaped black material (BM disk) within the middle and lower fault zones in Hole B. The microscopic features of the BM disks indicated that they were pseudotachylytes, and they showed high magnetic susceptibility, possibly the result of intense shearing or high temperature conditions. Inorganic carbon content of the BM disks was low, possibly because of thermal decomposition of carbonate minerals. The high temperatures might be related to frictional heating during the earthquake, implying that the BM disks were produced under intense shearing with frictional heating that reached melting temperature. Because the disks, which provide the only evidence of melting, pre-date the 1999 earthquake, we concluded that frictional melting did not occur during the earthquake.

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