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Seismic Monitoring in Hawaii Kanoa Koyanagi NOAA Pacific Tsunami Warning Center [email protected] Seismic Network Operators NOAA Pacific Tsunami Warning Center (PTWC) • Established in 1949 after the 1946 Aleutian Islands tsunami that devastated Hilo, Hawaii. • Operates 17 seismic stations throughout Hawaii. USGS Hawaiian Volcanoes Observatory (HVO) • Established in 1912 to monitor Hawaii’s volcanoes. Operated continuously by the U.S. Geological Survey since 1947. • Operates 60+ seismic stations on the Island of Hawaii. USGS National Strong Motion Project (NSMP) • Established in 1932 by the engineering seismology community to record strong motion ground motion in urbanized areas. • Operates 700+ stations in the U.S., 32 throughout Hawaii. IRIS Global Seismic Network (GSN) • Established in 1984 as a joint partnership between the National Science Foundation’s IRIS Consortium and the USGS. • Operates 150+ high quality broadband stations, 2 in Hawaii. December 2011 PTWC Field Hardware Broadband + StrongMotion Sites: all of the following: • Streckeisen STS-2 broadband seismometer • Kinemetrics EpiSensor ES-T accelerometer • Kinemetrics Q330 digitizer • Kinemetrics Marmot field server Strong-Motion + Short-Period Sites: either • Kinemetrics Basalt digitizer/field server with embedded EpiSensor ES-T accelerometer or • NetDAS digitizer/field server with Metrozet TSA100S accelerometer + • Some sites with additional GeoTech S-13 short-period vertical seismometers Site Photos Combination of existing vaults with newly constructed vaults. Mauna Loa, Hawaii Kekaha, Kauai Haleakala, Maui Seismic Data Acquisition Antelope • Import Q330 (orb2orb) • Data export to IRIS (orb2orb ?) Earthworm • Import Basalt (slink2ew), NetDas (grf2ew) • Data exchange with HVO (import/export), IRIS (liss2ew), NSMP Seismic Data Processing Location • • SPLERT (System for Processing Local Earthquakes in Real Time) – an Earthworm-based legacy system Earthworm v7.5 – eq_assemble and eqproc, pick_ew, binder, hyp2000 Magnitude • • SPLERT Pmag (for paging), eqcoda (MD), localmag (ML) Mwp processing for events larger than ~M6.0 Performance Goal • To issue local Hawaii tsunami bulletins within 90 seconds of origin time. PTWC Data at IRIS DMC Data exported to and archived by the IRIS DMC since September 2011. Mahalo (Thank You)