Natural Catastrophe·Monitoring
Indonesia Issues Tsunami Warning for Northeast Coastal Areas
🇮🇩 Northeast coastal areas of Indonesia· Country8 Jun
7 reportsPROPMHMC+2
LowAI Refreshed
ClosedLow impactAI Generated
M5.7 Earthquake – South Sandwich Islands Region (20 May 2026)
Occurred 20 May 2026·Detected 20 May 2026·
🇬🇸 South Sandwich Islands Region, South Atlantic Ocean2 reportsEnded 30 May 2026
Natural CatastrophePropertyMarine CargoEnergyCasualty & LiabilityReinsurance
A magnitude 5.7 earthquake occurred in the South Sandwich Islands Region at 23:00 UTC on 20 May 2026, at a depth of approximately 112 km. GDACS issued a Green alert level, indicating low humanitarian and physical impact. The remote location and deep focal depth significantly reduce the risk of surface damage or tsunami generation. No population centres of note are known to be affected.
AI-generated from linked source reports. See our correction policy.
Impact verdict
Low impact. The GDACS Green alert level, remote and largely uninhabited location, and deep focal depth of 112 km all point to minimal to no insured losses. No significant infrastructure or population centres are present in the South Sandwich Islands Region.
View assessment methodologyHow we grade what we know -- Known · Reported · Uncertain. Methodology →
Intelligence ledger
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Known5 lines
Earthquake magnitude: 5.7M▾
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Focal depth: 112.1 km▾
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Event time: 20 May 2026, 23:00:58 UTC▾
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Location: South Sandwich Islands Region▾
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GDACS alert level: Green▾
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Reported1 line
Affected population described as unknown by GDACS▾
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Uncertain2 lines
Any localised ground shaking impacts on the uninhabited islands▾
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Whether any vessels were operating in the vicinity at the time of the event▾
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Affected countries
🇬🇸 South Georgia and the South Sandwich Islands
Timeline
Status Change2 Jun 2026, 13:05
Lifecycle changed
monitoring → closed
Closure2 Jun 2026, 13:05
Event Closed
auto_closed_monitoring_timeout
Corroboration30 May 2026, 01:48
A magnitude 5.0 earthquake occurred in the South Sandwich Islands region at approximately 59.17°S, 26.39°W, at a depth of around 96km. The South Sandwich Islands are a remote, uninhabited British Overseas Territory in the South Atlantic with no commercial infrastructure. There is no London Market loss pathway as there are no insured assets, population centres, or commercial infrastructure in the affected area.
Source: EMSC Earthquakes (Official Advisory) · View source
Status Change29 May 2026, 05:30
Status changed to monitoring
Auto-transitioned: no updates for 6 hours
active → monitoring
Status Change28 May 2026, 22:36
Status changed to active
remediation: existing authoritative signal
signal → active
Initial Detection20 May 2026, 23:34
Initial Detection
A magnitude 5.7 earthquake occurred in the South Sandwich Islands Region at 23:00 UTC on 20 May 2026, at a depth of approximately 112 km. GDACS issued a Green alert level, indicating low humanitarian and physical impact. The remote location and deep focal depth significantly reduce the risk of surface damage or tsunami generation. No population centres of note are known to be affected.
On 5/20/2026 11:00:58 PM, an earthquake occurred in South Sandwich Islands Region potentially affecting [unknown]. The earthquake had Magnitude 5.7M, Depth:112.069km. Alert level: Green.
Source: GDACS Alerts (Official Advisory) · View source
Lloyd's classifications
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