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Magnitude 8.1 - SOLOMON ISLANDS

2007 April 1 20:39:56 UTC

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Earthquake Details

Magnitude 8.1
  • Sunday, April 1, 2007 at 20:39:56 (UTC)
    = Coordinated Universal Time
  • Monday, April 2, 2007 at 7:39:56 AM
    = local time at epicenter
  • Time of Earthquake in other Time Zones
    Location 8.481°S, 156.978°E
    Depth 10 km (6.2 miles) set by location program
    Distances 45 km (30 miles) SSE of Gizo, New Georgia Islands, Solomon Isl.
    205 km (125 miles) S of Chirovanga, Choiseul, Solomon Islands
    345 km (215 miles) WNW of HONIARA, Guadalcanal, Solomon Islands
    2145 km (1330 miles) NNE of BRISBANE, Queensland, Australia
    Location Uncertainty horizontal +/- 8.8 km (5.5 miles); depth fixed by location program
    Parameters Nst=156, Nph=156, Dmin=343 km, Rmss=1.19 sec, Gp= 32°,
    M-type=moment magnitude (Mw), Version=8
    Source USGS NEIC (WDCS-D)
    Event ID us2007aqbk
    • This event has been reviewed by a seismologist.
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    Earthquake Summary

    Small globe showing earthquake Small map showing earthquake

    Earthquake Summary Poster

  • The following is a revised REPEAT revised release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred about 40 km (25 miles) SSE of Gizo, New Georgia Islands, Solomon Islands or about 345 km (215 miles) WNW of HONIARA, Guadalcanal at 2:39 PM MDT, Apr 1, 2007 (Apr 02 at 7:39 AM local time in Solomon Islands). The magnitude and location may be revised when additional data and further analysis results are available. Detailed information about tsunami watches and warnings is available from the NOAA Tsunami Warning Centers at

  • Felt Reports

    At least 34 people killed, an undetermined number missing and several villages destroyed by the earthquake and tsunami. About 300 homes, schools and a hospital were destroyed at Sasamunga and about 500 houses were damaged at Gizo. Tsunami damage also occurred on Lefung and Taro. Felt at Honiara. The tsunami also caused damage on Rossel Island and Bougainville, Papua New Guinea.

    Tectonic Summary

    The Solomon Islands earthquake of April 1, 2007, occurred along the boundary of the Pacific plate with, respectively, the Australia, Woodlark, and Solomon Sea plates. The latter three plates converge to the east-northeast or northeast against the Pacific plate with velocities of 90-105 mm/y. Along much of the plate boundary between the Pacific plate and the Australia/Woodlark/Solomon Sea plates, relative plate-motion is accomplished principally by subduction of the Australia/Woodlark/Solomon Sea plates beneath the Pacific plate. The April 1 earthquake's location and focal mechanism are consistent with the earthquake having occurred as underthrusting of the Australia/Woodlark/Solomon Sea plate beneath the Pacific plate, as part of the broader northeast-directed subduction process.

    The Solomon Islands arc as a whole experiences a very high level of earthquake activity, and many shocks of magnitude 7 and larger have been recorded since the early decades of the twentieth century. The April 1 earthquake, however, nucleated in a 250-long segment of the arc that had produced no shocks of magnitude 7 or larger since the early 20th century

    Tsunami Information Tsunami Information

    • Preliminary Earthquake Report
    • U.S. Geological Survey, National Earthquake Information Center
      World Data Center for Seismology, Denver

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