official data (USGS NEIC) · interrupt-adjacent ~M6.5+
USGS stamps an M6.5 west of Nikolski — tsunami flag on, green alert
A reviewed USGS M6.5 struck west of Nikolski in the Aleutians this morning — interrupt-adjacent on magnitude, intermediate-depth, PAGER green, with the USGS tsunami product flag on because NTWC issued an information statement that says a tsunami is not expected.
Key facts
- Event
- us7000ti1p · status reviewed · magType mww
- Preferred magnitude
- M 6.5 mww
- Origin
- 2026-09-17 14:19:53 UTC (~10:19 AM EDT)
- Epicenter
- 165 km W of Nikolski, Alaska · −171.2949°, 52.7648° · depth 111.666 km
- Products
- origin, phase-data, moment-tensor, DYFI, ShakeMap, ground-failure, PAGER, NTWC impact-link
- Flags at fetch
- tsunami 1 · alert green · felt 8 · cdi 3.4 · mmi ~4.786 · sig 653
- NTWC (WEAK53)
- Tsunami Information Statement — evaluation: “An earthquake has occurred; a tsunami is not expected.” (flag 1 = product linked, not a Warning/Advisory)
- Live
- Revisions → live USGS HUD / event page
USGS tsunami flag 1 means an NTWC product is linked — here an information statement whose plain English is that a tsunami is not expected.
Desk reading of USGS us7000ti1p + NTWC WEAK53
Note
USGS reviewed event us7000ti1p puts a M6.5 mww at 14:19 UTC on September 17 — about 10:19 AM EDT — 165 km west of Nikolski, Alaska, at depth 111.666 km. PAGER alert green. DYFI: 8 felt reports, CDI 3.4, MMI about 4.8. The USGS tsunami flag is 1 because an NTWC Tsunami Information Statement (WEAK53) is linked; that statement’s evaluation line is that a tsunami is not expected. Distinct from boarded Java M6.5 us7000tgrk and from the older Sep 3 Nikolski M6.3 us7000tdvt.
Attribution: USGS NEIC event us7000ti1p (event page + detail GeoJSON). Secondary: NWS National Tsunami Warning Center Tsunami Information Statement WEAK53 / TIBAK1 Number 1 (623 AM AKDT Thu Sep 17 2026). Live mag/depth/PAGER revisions → HUD / USGS eventpage. Not inventing coastal wave heights or aftershock counts.
Why it matters
A deep Aleutian M6.5 is the meter that lights up the board without lighting up a coastal siren: USGS reviewed it, PAGER stayed green, and the tsunami center’s plain English is “not expected.” Mom-readable dread is a big number offshore that still gets an official information-only stamp — watch the HUD if the products revise.
Sources
- USGS National Earthquake Information Center
- USGS detail GeoJSON us7000ti1p
- NWS National Tsunami Warning Center — Tsunami Information Statement WEAK53 (Number 1)
Official data. Live values go to the HUD / source product.