SERIAL REVERSE AND STRIKE-SLIP ON IMBRICATE FAULTS - THE COASTAL RANGE OF EAST TAIWAN

Holocene marine chronologies for three segments of the Coastal Range o f east Taiwan indicate that there has been broadly uniform uplift of a bout 3-5 mm/yr during the past 8000 yr. Previous reports have cited lo cal Holocene uplift rates as high as 14 mm/yr, and geodetic measuremen ts indicate uplift of as much as 20 mm/yr. Furthermore, the seismic re cord reflects contraction of 26-54 mm/yr, whereas the Luzon volcanic a re is here being subducted beneath Eurasia at an average rate of 68 mm /yr. We attribute the discrepancies in both uplift and contractional m easurements to distributed deformation between upthrust imbricate slic es of an accreted sediment prism, the vertical component being taken u p by serial reverse slip on the thrusts that bound the slices and the horizontal component being taken up by serial strike slip along the th rusts.