1975 Bougainville Earthquake Damage And Seismic Analysis Report

A magnitude 7.9 earthquake caused at least $300,000 AUD in damage and generated a two-meter tsunami near Bougainville on 20 July 1975. The report details geological effects like landsliding and liquefaction, and analyzes the fault mechanism and aftershock zone spanning 12,500 square kilometers. This analysis was published by the Australian Ocean Data Network.

Use Cases

• Analyze the relationship between earthquake magnitude (MS7.9) and estimated damage costs ($300,000 AUD) for historical risk modeling.
• Study the spatial distribution of aftershock epicentres within the 12,500 sq km elliptical zone for seismic pattern recognition.
• Model tsunami generation based on reported maximum amplitude of about two meters following the principal earthquake.
• Investigate fault-plane characteristics, including underthrusting direction and dip of about 37°, for tectonic studies.
• Identify the aseismic zone centered at 6°S, 154°E as a candidate for future major earthquake forecasting.

Strengths

• Report provides specific quantitative data including earthquake magnitude (MS7.9), damage estimate ($300,000 AUD), and aftershock area (12,500 sq km).
• Includes detailed qualitative observations of multiple geological effects (landsliding, liquefaction, subsidence, building damage).
• Contains expert seismic analysis of fault mechanisms and identifies a potential future earthquake zone.

Limitations

• Data is confined to a single historical event from 1975, limiting temporal scope.
• Original data collection methods and primary source details are not specified in the description.
• The report format (PDF/HTML) is not structured for direct computational analysis.

Provenance

Source

Australian Ocean Data Network.

Collection Method

null

Time Range

20 July 1975 (primary event).

Freshness

Last updated metadata indicates 2026, but the underlying event and report are from 1975.

Geography

Northern Solomon Islands chain, specifically the southern Bougainville/Shortland Islands region and offshore areas.