PSN-L Email List Message

Subject: seismic coda
From: "David Saum" DSaum@............
Date: Tue, 17 Apr 2001 10:11:06 -0400

--From Phys. Rev. Lett. 86, 3447
For minutes after the violent shaking of an earthquake, the ground
continues to rock imperceptibly. Seismologists are unclear about the
cause of this so-called seismic coda, but the 9 April PRL presents
new evidence that may resolve the question. While some seismologists
assume that the coda comes from waves that scatter only once before
reaching the surface, the authors found evidence that the vibrations
reflect many times within the Earth before being detected. They used
an array of seismometers that could distinguish several types of
shaking and showed that energy is divided equally among them, as
theory predicts for multiply scattered waves.
(R. Hennino et al., Phys. Rev. Lett. 86, 3447.
Link to the paper:
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Larry Cochrane <cochrane@..............>