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Dr. David Schaff

Lamont Associate Research Professor, Seismology, Geology and Tectonophysics, Lamont-Doherty Earth Observatory (LDEO), Columbia Climate School

108C Seismology
P.O. Box 1000
61 Route 9W
Palisades, NY 10964

BIOGRAPHY:

My research has involved applying massive waveform cross correlation to earthquake location, earthquake detection, repeating events, measuring temporal changes in the crust associated with large earthquakes, testing competing models of foreshock occurrence, studying the earthquake source using empirical Green’s functions, and nuclear monitoring.

PROJECTS

Only select projects listed below
Name Start Date End Date
Analysis of Microseismicty at Parkfield, California, Through Improved Detection and Location 6/1/09 5/31/10
Comprehensive High-Precision Relocation of Global Seismicity 2/1/12 1/31/16
Comprehensive high-precision relocation of global seismicty 2/15/16 1/31/20
Improving Magnitude Detection Thresholds Using Multi-Station, Multi-Event, and Multi-Phase Methods 6/29/05 6/30/08
Investigating the Presence of Preseismic Velocity Changes 9/15/09 8/31/12
Investigation of Data-Intensive Discovery Methods for Improved Seismic Monitoring 5/1/11 8/31/18
Near-Real-Time Monitoring, Analysis and Forecast of Repeating Earthquake in Northern California 1/1/11 12/31/12
Testing Predictions from the Cascade and Pre-Seismic Slip Models for Foreshock Occurrence with the High Precision Catalog for Northern California 4/1/10 3/31/14
Precision Seismic Monitoring in Northern California: Updating and Improving the Real-time Double-difference (RTDD) System 1/1/20 12/31/20
Using a Correlation Detector to Reduce the Magnitude Threshold of a Foreshock and Aftershock Catalog of the 2004 Parkfield Earthquake to Test Models of Foreshock and Aftershock Occurrence 4/1/20 3/31/21
Improving Detection and Location of Small Seismic Events Using Data from A Rare Deployment 5/1/20 4/30/21
Correlation Detection and Location of Small Seismic Events in a Broad Region of Interest using data from a Rare Deployment 9/30/20 9/29/21
Using Repeating Foreshocks as Creep Meters at Depth to Test an Aseismic Pre-slip Model for some Large Earthquakes 5/1/23 4/30/24

8 PUBLICATIONS ON COLUMBIA | ACADEMIC COMMONS

Only select publications listed below
Name Published Date
Back-arc extension in the Andaman Sea: Tectonic and magmatic processes imaged by high-precision teleseismic double-difference earthquake relocation 2013
Radiography of a normal fault system by 64,000 high-precision earthquake locations: The 2009 L'Aquila (central Italy) case study 2013
Seismological Constraints on Proposed Low-Yield Nuclear Testing in Particular Regions and Time Periods in the Past, 2012
Large-scale relocation of two decades of Northern California seismicity using cross-correlation and double-difference methods 2008
Regional and teleseismic double-difference earthquake relocation using waveform cross-correlation and global bulletin data 2007
Streaks, multiplets, and holes: High-resolution spatio-temporal behavior of Parkfield seismicity 2004
High-resolution image of Calaveras Fault seismicity 2002
Post seismic response of repeating aftershocks 1998

CONTACT

dschaff@ldeo.columbia.edu

845-365-8826