18 March 2005 TTRC The Hawaiian Islands Seismic Network Local Tsunami Warnings from Earthquake Early Warning and Mwp. Barry Hirshorn and Gerard Fryer,

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Presentation transcript:

18 March 2005 TTRC The Hawaiian Islands Seismic Network Local Tsunami Warnings from Earthquake Early Warning and Mwp. Barry Hirshorn and Gerard Fryer, Richard Hagemeyer Pacific Tsunami Warning Center University of Hawaii at Manoa

Tsunamis from the Big Island Major coastal earthquakes shaded Largest confirmed eathquakes and tsunamis: 1868, produced no tsunami The ~1600AD earthquake is required to explain deposits at Maha’ulepu, Kauai Tsunami travel times (minutes) from a South Kona earthquake Tsunami Sources (cross section of a Hawaiian volcano)

Present warning timeline (ideal)

The Effect using Longer Period Data on Mwp.

Mwp and Local Earthquakes Mwp is limited by the trade off between the S-P travel time, and the source duration of the event. Appears to work well at less than 5 degrees epicentral distance. Depending on the Mw and source length, Mwp provides an estimate that is low by an amount that decreases between 1-5 degrees epicentral distance. Will automate it for local earthquakes.

84 Mwp Observations Within 5 Degrees of The Epicenter

Warning timeline after upgrade

The Hawaiian Islands Seismic Network Funding requested by the President, recommended by House Committee on Science, included in Senate Bill 50, The Tsunami Preparedness Act. Funding FY05: $0.5 million FY06: $1.0 million Maintenance in NWS budget Working Committee Charles McCreery (NOAA) Harley Benz (USGS) Robert Cessaro (NOAA) Gerard Fryer (UHM) Barry Hirshorn (NOAA) David Oppenheimer (USGS) Paul Okubo (USGS) Special thanks to Senator Daniel Inouye Jeff LaDouce, NOAA Rhett Butler, IRIS Kent Anderson, IRIS

The Future? PTWC is interested in more Interaction with the Seismological Community. Held a Workshop in Ewa Beach, June with USGS and others to co- ordinate and plan out upgrade. More staff to look at these problems soon. Software: prototyping and testing EEW systems in Hawaii, in particular for the Local Earthquake/Tsunami problem.