Global studies of earthquake source parameters have suggested that high stress drop events are more likely to occur in intraplate regions, along strike-slip faults, and at deeper depths. These studies combine stress drops determined from a variety of methods whose uncertainties are poorly known. The PIs will investigate the validity of these general observations by using a single analysis technique (empirical Green¡¯s function method) on moderate-sized (4.0

The researchers will focus on a preliminary study of earthquakes along the margin of the North Island of New Zealand where the Pacific plate is being subducted (pushed) beneath the island. This margin has large, along-strike variations in geology and structure that affect how parts of the Pacific plate stick or creep as the plate descends. The results will also be relevant to studies of SSE and seismic hazards in other subduction zones such as Cascadia and Alaska. Since many urban regions of the world (e.g. Japan, Cascadia, Indonesia, Chile) are located along these types of plate margins, the results will be useful to scientists who study geologic and tectonic processes at these margins, as well as to improving earthquake hazards models and building codes for these highly urbanized areas. The results of the uncertainty analysis will be useful to researchers studying how similar earthquakes are to one another or how valid it is to use observations from small earthquakes to predict what may happen in larger earthquakes.

Agency
National Science Foundation (NSF)
Institute
Division of Earth Sciences (EAR)
Type
Standard Grant (Standard)
Application #
1113593
Program Officer
Eva E. Zanzerkia
Project Start
Project End
Budget Start
2011-09-01
Budget End
2014-08-31
Support Year
Fiscal Year
2011
Total Cost
$140,364
Indirect Cost
Name
Boston University
Department
Type
DUNS #
City
Boston
State
MA
Country
United States
Zip Code
02215