1975 Bougainville Earthquake Effects Report with Damage and Aftershock Analysis

A magnitude 7.9 earthquake on 20 July 1975 caused at least $300,000 in damage and a two-metre tsunami in the Solomon Islands. The report details landsliding, liquefaction, and damage to villages and mining installations, with aftershocks covering 12,500 square kilometres. Geoscience Australia provides this analysis, including fault-plane solutions and identification of a future seismic risk zone.

Use Cases

• Modeling tsunami generation and coastal impact based on the reported two-metre wave amplitude.
• Analyzing aftershock patterns and focal depths (30-70 km) for seismic sequence studies.
• Assessing economic and infrastructure damage from earthquakes based on the detailed damage descriptions.
• Studying fault mechanics and underthrusting based on the provided fault-plane solution and dip angle.
• Identifying future earthquake risk zones based on the described aseismic area adjacent to the fault zone.

Strengths

• Provides specific, quantified details including earthquake magnitude (MS7.9), damage cost ($300,000 AUD), and tsunami amplitude (~2 metres).
• Includes detailed geological observations such as aftershock area (12,500 sq km), focal depth range, and fault dip angle (~37°).
• Authored by the authoritative national geological organization, Geoscience Australia.

Limitations

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

Provenance

Source

Geoscience Australia Data

Collection Method

Likely contains scientific analysis and reports from geological surveys and post-event studies.

Time Range

Focused on the 20 July 1975 event and its immediate aftermath, with context from 1970 and 1974.

Freshness

Last updated 2026-04-20 01:35:55.398378; freshness should be verified.

Geography

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