[1] Univ Washington, Sch Oceanog, Seattle, WA 98195 USA
[2] IRIS PASSCAL Instrument Ctr, IRIS Data Management Ctr, Socorro, NM 87801 USA
[3] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA
[4] Washington State Dept Nat Resources, Olympia, WA 98504 USA