Office of Research, UC Riverside
Abhijit Ghosh
Associate Professor of Geophysics
Earth and Planetary Sciences
aghosh@ucr.edu
(951) 827-4493


RAPID: Collaborative Research: Triggered Aftershocks and Tremors following the Kaikoura Earthquake recorded with Arrays (KEA)

AWARD NUMBER
008812-002
FUND NUMBER
33324
STATUS
Active
AWARD TYPE
3-Grant
AWARD EXECUTION DATE
2/16/2017
BEGIN DATE
2/15/2017
END DATE
1/31/2018
AWARD AMOUNT
$10,080

Sponsor Information

SPONSOR AWARD NUMBER
1725302
SPONSOR
NATIONAL SCIENCE FOUNDATION
SPONSOR TYPE
Federal
FUNCTION
Organized Research
PROGRAM NAME

Proposal Information

PROPOSAL NUMBER
17070885
PROPOSAL TYPE
New
ACTIVITY TYPE
Basic Research

PI Information

PI
Ghosh, Abhijit
PI TITLE
Other
PI DEPTARTMENT
Earth Sciences
PI COLLEGE/SCHOOL
College of Nat & Agr Sciences
CO PIs

Project Information

ABSTRACT

This project supports the deployment a dense array of seismic arrays around the Cook Strait in New Zealand to record deep tectonic tremor and aftershocks following the M7.8 Kaikoura earthquake. This was the second largest seismic event since the European settlement in New Zealand, and it triggered deep and shallow slow-slip events along the Hikurangi subduction zone. The ongoing slow-slip events have apparently increased the probability of an M~8 megathrust earthquake in this region. Hence, this network can provide useful information on how slow-slip and tremor evolves on the megathrust following a large earthquake. This project involves international collaborations among United States, New Zealand and China, and will support a junior faculty at UC Riverside.

Four mini-arrays (each has 12 5-s flex-nodes) together with 17 short-period and broadband seismometers, will be deployed around the Cook Strait for up to one year. This hybrid network is strategically planned to complement and take advantage of the existing and planned deployment in the area to be able to have high-resolution locations of seismic events in the region. Seismic data collected during this experiment will be made available to IRIS DMC as soon as the experiment is finished. The collected seismic data can be used to understand the relationship among the M7.8 Kaikoura mainshock, ongoing afterslip, triggered slow-slip events and the accompanying tremor activities, and quantify the physical mechanisms for tremor and microseismicity.
(Abstract from NSF)