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A New Ground Truth Data Set For Seismic Studies

K. L. McLaughlin
Science Applications International Corporation

The first 20% of the full text of this article appears below.

	INTRODUCTION

 
Ground truth seismic sources and receivers are the seismologist's equivalent of the geodesist's "benchmark." Geodesists measure distances between benchmarks on the surface of the Earth to infer the Earth's shape. Seismologists measure seismic travel-times between sources and receivers to image the Earth's interior velocities. However, unlike geodesists who precisely locate both ends of their benchmark network in a well-defined coordinate system, seismologists rarely know the precise location (or origin time) of their source "benchmark." Consequently, source location biases fold into tomographic images of the Earth's interior. Joint source location and velocity inversion mitigates but does not remove these fundamental biases (e.g., Zhang and Thurber 2003; Michelini and Lomax 2004). In recognition of this problem, seismologists either incorporate "ground truth" (GT) events with well-established source locations and origin times into their inversions or use them in test relocation exercises to assess or validate their velocity models (e.g., Flanagan et al. 2007; Morozov et al. 2005; Murphy et al. 2005; Ritzwoller et al. 2003; Yang et al. 2004). In some cases, the events may have been used in both the model inversion and the model assessment. Until recently, the catalogs of these events (and their arrival times) have been largely limited to nuclear explosions detonated at a few test sites. Several efforts over the last decade have attempted to collect data for an extended family of seismic events with varying degrees of location, depth, and origin time uncertainty (e.g. Bondár, Engdahl et al. 2004; Waldhauser and Richards 2004). This article reports on a newly available catalog of GT0-5 events and their quality-controlled arrival times.

	NEW GT0-5 DATA SET

 
The database of more than 7,000 GT0-5 events and their nearly 500,000 quality-controlled arrivals is submitted to the International Association of Seismology and Physics . . . [Full Text of this Article]

International Seismological Centre
Pipers Lane, Thatcham
Berkshire RG19 4NS
United Kingdom
istvan@isc.ac.uk
(I. B.)