Earthquake with magnitude of 7.8 has occurred in vicinity 55-12N 158-36W at 220613Z jul
Gulf of Alaska · NAVAREA XII 315/20
What this record establishes
Archived notice · 2020-07-22 08:55Z
This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.
- Source and dates
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NTWC 220815Z JUL 20.. Issued 2020-07-22 08:21Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- Gulf of Alaska. The parsed report position is 55.200, -158.600. It is a position in the source message, not a live location. Check the original wording for limits and qualifications.
Related notices and cancellation links
- Cancel NAVAREA XII 315/20 and this msg, tsunami warning cancelledlater cancellation notice
These reports were linked by category and sea, with positions within 30 nautical miles and issue dates within 30 days of another report's recorded in-force span. Links can extend through other members, so the full group can cover a larger area or period. Proximity does not confirm that they describe one incident.
- USGS-US7000ASVB2020-07-22 · Cancelled notice
- USGS-US7000ASX42020-07-22 · Cancelled notice
- NAVAREA XII 313/202020-07-22 · Archived notice
- NAVAREA XII 314/202020-07-22 · Archived notice
- USGS-US7000ASY02020-07-22 · Cancelled notice
- NAVAREA XII 315/20 · this notice2020-07-22 · Archived notice
Current notices and reporting history in the Gulf of Alaska →
- issued
- 2020-07-22 08:21Z
- status
- Archived notice
- authority
- NTWC 220815Z JUL 20.
- NAVAREA
- NAVAREA XII
- issued by
- NTWC
- sea
- Gulf of Alaska
- position
- 55.200, -158.600
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
GULF OF ALASKA. EASTERN NORTH PACIFIC. ALASKA. EARTHQUAKE WITH MAGNITUDE OF 7.8 HAS OCCURRED IN VICINITY 55-12N 158-36W AT 220613Z JUL. A TSUNAMI WARNING HAS BEEN ISSUED.
Reading this warning
- Position (degrees and minutes)
- How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
- Date-time group (DTG)
- A compact UTC timestamp — day, hour and minute followed by Z — such as 201500Z for the 20th at 15:00 UTC.
Collected reports in this area · earthquake & tsunami bulletins
73 within 180 nm since 1997 · 0 in the last 12 months · 0 listed in force now
Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.
- 91 km sse of sand point, alaska2025-07-20
- 96 km sse of sand point, alaska2025-07-17
- 2025 sand point, alaska earthquake2025-07-16
- 155 km ssw of akhiok, alaska2025-02-13
- 146 km sse of sand point, alaska2024-08-01
- 85 km ssw of sand point, alaska2023-08-03
Month of issue in the collected archive
All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.
Nearby notices listed in force · within 120 nm
No other collected notice is currently listed in force within this radius. This does not establish safe conditions.
Worldwide in the collected sources
2 earthquake & tsunami bulletins listed in force · see all
Record snapshot 2026-10-03 11:48Z; source collection times vary.
Quakes
Undersea earthquakes of magnitude 5.5 and above (USGS) and the tsunami bulletins NAVAREA coordinators relay. All current earthquake & tsunami bulletins →
Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.