Can teleseismic mb be affected by rock damage around explosions?
Article first published online: 16 JAN 2013
©2012. American Geophysical Union. All Rights Reserved.
Geophysical Research Letters
Volume 40, Issue 1, pages 100–104, 16 January 2013
How to Cite
2013), Can teleseismic mb be affected by rock damage around explosions?, Geophys. Res. Lett., 40, 100–104, doi: 10.1029/2012GL054526., and (
- Issue published online: 29 JAN 2013
- Article first published online: 16 JAN 2013
- Manuscript Accepted: 13 DEC 2012
- Manuscript Revised: 10 DEC 2012
- Manuscript Received: 7 NOV 2012
- Department of Energy for the Los Alamos National Laboratory. Grant Number: DE-AC52-06NA25396
- SRT. Grant Number: 72276-001-09
 Effects of rock damage on teleseismic mb are investigated with P wave synthetic seismograms using a moment dipole Mzz as the equivalent elastic model for damage around buried explosions. Two manifestations of late-time damage, cavity rebound and bulking from block rotations, are represented by model decompositions into compensated linear vector dipole and monopole sources, respectively. For high-velocity media, P waves from damage destructively interfere with those from the explosion. This interference reduces the rate at which mb yield scales for a pure monopole source and provides a physical basis for observed scaling in hard rock, mb ~ 0.75 log[yield]. For over-buried explosions, such as the North Korean tests, P waves from damage are weaker, and higher scaling rates are expected than explosions conducted under standard containment conditions. Our results highlight a cautionary note of transporting the same mb-log[yield] relation between test sites to estimate yield when source phenomenology is likely to be very different.