1975 Bougainville Earthquake and Tsunami Effects Report

Bougainville and the Solomon Islands were affected by a major earthquake and tsunami on 20 July 1975. The report details damage estimated at $300,000 (Australian), geological effects like landslides and liquefaction, and the earthquake's tectonic context. The data originates from Geoscience Australia and was last updated in March 2026.

Use Cases

• Modeling tsunami risk and impact based on the reported two-metre maximum amplitude.
• Analyzing patterns of geological damage based on described effects like landsliding, liquefaction, and subsidence.
• Studying aftershock sequences based on the reported elliptical area of 12,500 square kilometres.
• Investigating tectonic fault mechanisms based on the described underthrusting with a dip of about 37°.

Strengths

• Provides specific quantitative details, including earthquake magnitude (MS7.9), damage cost ($300,000), and aftershock area (12,500 sq km).
• Includes detailed qualitative observations of geological effects and infrastructure damage.
• Offers tectonic analysis, including fault-plane solution and connection to a 1974 earthquake series.

Limitations

• Row count and column-level documentation are absent; field semantics must be inferred after download.
• Data is presented in HTML/PDF formats, which may require extraction for computational analysis.

Provenance

Source

Geoscience Australia Data

Collection Method

Likely compiled from seismic monitoring, field surveys, and geological analysis.

Time Range

Primary event on 20 July 1975, with context from 1970 onward.

Freshness

Last updated 2026-03-25 16:40:14.057339; freshness should be verified.

Geography

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