Philip Barnes, Ph.D.
National Institute of Water & Atmospheric Research (NIWA)
Wellington, New Zealand
Methods for deriving submarine paleoearthquake records
using high-resolution seismic reflection data:
examples from New Zealand.
Seismic profile across the Vernon Fault, Cook Strait
Wednesday — September 7, 2011
Pacific Forum — 3:00 p.m.
The paleoearthquake histories of active faults on land are commonly determined by geomorphic studies, trenching investigations, and the dating of surface rupturing events. In the marine environment, where indirect earthquake proxies are commonly used, new approaches involving analysis of fault growth in high-resolution seismic reflection sections are now offering exciting opportunities in paleoseismology. I will introduce some generic concepts and methodology, discuss advantages and limitations of the seismic reflection applications, and present examples of long-time scale (18 ka) records for three of the large Marlborough faults in Cook Strait. Comparison of the results with onshore paleoseismic records are suggestive of regional earthquake clustering resulting from fault interactions.
Next: September 14 — Tom Richards, PhD