[1] U.S. Geological Survey, MS 977, 345 Middle field Road, Menlo Parky,CA,94025, United States
[2] Dept. of Earth and Space Sciences, University of Washington, 63 Johnson Hall, Box 351310, Seattle,WA,98195, United States
[3] Dept. of Earth and Space Sciences, University of Washington, U.S. Geological Survey, Box 351310, Seattle,WA,98195, United States