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Regional Coda Magnitude in Central Asia

LA-UR-00-2559
W.S. Phillips, H.E. Hartse, and K.M. Mayeda*
Geophysics Group (EES-11), Los Alamos National Laboratory
*Lawrence Livermore National Laboratory



Introduction

Coda yield more accurate and precise estimates of source effects than can be obtained from direct waves.

The improved accuracy results from path averaging of the scattered waves.

The improved precision results from stacking independent measurements.

In the following pages, we investigate the use of regional distance Lg coda to estimate magnitudes in central Asia.

This is an geologically heterogeneous region, which, as we will show, introduces path bias into the coda measurements, yet coda still give magnitude estimates that are nearly a factor of two more consistent between stations than do Lg.

CLICK ON IMAGE AT RIGHT TO ENLARGE
Q tomography results
reflect the geologic heterogeneity
of this region.

Introduction | Data Processing | Coda Length Bias | Path Bias
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