1. IRIS DMC, 1408 NE 45th Street, Seattle, Washington 98105 U.S.A., manoch@iris.washington.edu
2. U.S. Geological Survey, 1711 Illinois Street, Golden, Colorado 80401 U.S.A.
3. Earth and Space Sciences, University of Washington, 4000 15th Avenue NE, Seattle, Washington 98195‐1310 U.S.A.