How Good Is Your Location? Comparing and Understanding the Uncertainties in Location for the 1993 Rock Valley Sequence

Author:

Pyle Moira L.1ORCID,Chen Ting2ORCID,Preston Leiph3,Scalise Michelle4ORCID,Zeiler Cleat4,Smith Kenneth D.5ORCID

Affiliation:

1. 1Lawrence Livermore National Laboratory, Livermore, California, U.S.A.

2. 2Los Alamos National Laboratory, Los Alamos, New Mexico, U.S.A.

3. 3Sandia National Laboratories, Albuquerque, New Mexico, U.S.A.

4. 4Nevada National Security Site, Las Vegas, Nevada, U.S.A.

5. 5Nevada Seismological Laboratory, University of Nevada, Reno, Reno, Nevada, U.S.A.

Abstract

AbstractAccurate event locations are important for many endeavors in seismology, and understanding the factors that contribute to uncertainties in those locations is complex. In this article, we present a case study that takes an in-depth look at the accuracy and precision possible for locating nine shallow earthquakes in the Rock Valley fault zone in southern Nevada. These events are targeted by the Rock Valley Direct Comparison phase of the Source Physics Experiment, as candidates for the colocation of a chemical explosion with an earthquake hypocenter to directly compare earthquake and explosion sources. For this comparison, it is necessary to determine earthquake hypocenters as accurately as possible so that different source types have nearly identical locations. Our investigations include uncertainty analysis from different sets of phase arrivals, stations, velocity models, and location algorithms. For a common set of phase arrivals and stations, we find that epicentral locations from different combinations of velocity models and algorithms are within 600 m of one another in most cases. Event depths exhibit greater uncertainties, but focusing on the S-P times at the nearest station allows for estimates within approximately 500 m.

Publisher

Seismological Society of America (SSA)

Subject

General Chemical Engineering

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