Strong mag. 6.0 earthquake - 118km SE of Cold Bay, Alaska on Monday, 31 December 2018 - information
Strong mag. 6.0 earthquake - 118km SE of Cold Bay, Alaska on Monday, 31 December 2018
31 Dec 02:41 UTC: First to report: USGS after 6 minutes.
Dec 31 02:50: Magnitude recalculated from 5.8 to 5.5.
Hypocenter depth recalculated from 34.0 to 26.3 km.
Dec 31 03:01: Magnitude recalculated from 5.5 to 6.1.
Hypocenter depth recalculated from 26.3 to 26.9 km.
Dec 31 23:56: Magnitude recalculated from 6.1 to 6.0.
Hypocenter depth recalculated from 26.9 to 31.0 km.
Dec 31 02:50: Magnitude recalculated from 5.8 to 5.5.
Hypocenter depth recalculated from 34.0 to 26.3 km.
Dec 31 03:01: Magnitude recalculated from 5.5 to 6.1.
Hypocenter depth recalculated from 26.3 to 26.9 km.
Dec 31 23:56: Magnitude recalculated from 6.1 to 6.0.
Hypocenter depth recalculated from 26.9 to 31.0 km.
Local time at epicenter: 2018-12-30 15:35:37 -11:00
Magnitude: 6.0
Depth: 31.0 km
Epicenter latitude / longitude: 54.3874°N / 161.5066°W
(Alaska, United States)Nearest volcano: Dutton (115 km / 71 mi)
Nearby towns and cities:
91 km (57 mi) SE of King Cove (pop: 1000)
118 km (73 mi) SE of Cold Bay (pop: 100)
124 km (77 mi) SW of Sand Point (pop: 1,100)
133 km (83 mi) SE of False Pass (pop: 0)
180 km (112 mi) S of Nelson Lagoon (pop: 100)
Primary data source: USGS
Estimated released energy: 6.3 x 1013 joules (17.5 gigawatt hours, equivalent to 15080 tons of TNT or 0.9 atomic bombs!) [learn more]
Data for the same earthquake reported by different agencies
Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.
| Time | Mag. / Depth | Location | Source |
| 2018-12-31 02:35:37 UTC 2018-12-30 15:35:37 -11:00 | M 6.0 / 31 km | - 118km SE of Cold Bay, Alaska | USGS |
| 2018-12-31 02:35:35 UTC | M 6.0 / 10 km | Alaska Peninsula | GFZ |
| 2018-12-31 02:35:39 UTC | M 6.1 / 47 km | ALASKA PENINSULA | EMSC |
| 2018-12-31 02:35:38 UTC | M 6.0 / 29.4 km | Alaska Peninsula | GeoAu |
| 2018-12-31 02:35:41 UTC | M 6.1 / 34.4 km | Alaska Peninsula, United States [Sea: United States] | INGV |
User reports for this quake (10)
User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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Leave a comment if you find a particular report interesting or want to add to it.
Flag as inappropriate.
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Send your own user report!
Southwest Anchorage, AK (1015.5 km NE of epicenter) [Map] / not felt : I didn’t feel this one luckily. I already had quite the day experiencing the 7.1 Anchorage main shock and its aftershocks.
Wasilla / Strong shaking (MMI VI)
Anchorage, AK (1026.9 km NE of epicenter) [Map] / Light shaking (MMI IV) : Moderate, quick shake. (reported through our app)
Kenai / Weak shaking (MMI III)
Mayne Island / Very weak shaking (MMI II) : Disregard previous report. I misread the time.
Talkeetna / Weak shaking (MMI III)
99507 / Light shaking (MMI IV)
Aftershocks of the 6.0 quake 118km SE of Cold Bay, Alaska, 31 Dec 2018 02:35 UTC
More info
Recorded aftershocks, latest first (11 quakes):- 29 May 2019 08:09 UTC| M 2.5 |3.9 km (2.4 mi) depth|30 km (19 mi) distance| USGS | Details
- 29 Apr 2019 02:31 UTC| M 3.6 |35 km (21.7 mi) depth|22 km (13 mi) distance| USGS | Details
- 20 Apr 2019 22:32 UTC| M 3.9 |41.2 km (25.6 mi) depth|23 km (14 mi) distance| USGS | Details
- 08 Apr 2019 00:01 UTC| M 4.4 |35 km (21.7 mi) depth|29 km (18 mi) distance| USGS | Details
- 03 Apr 2019 13:00 UTC| M 3.1 |35 km (21.7 mi) depth|14 km (9 mi) distance| USGS | Details
- 13 Mar 2019 18:00 UTC| M 3.8 |9.8 km (6.1 mi) depth|37 km (23 mi) distance| USGS | Details
- 08 Mar 2019 23:14 UTC| M 2.7 |21.5 km (13.4 mi) depth|14 km (8 mi) distance| USGS | Details
- 04 Mar 2019 04:51 UTC| M 4.4 |44.1 km (27.4 mi) depth|53 km (33 mi) distance| USGS | Details
- 16 Feb 2019 23:09 UTC| M 3.6 |46.7 km (29 mi) depth|21 km (13 mi) distance| USGS | Details
- 14 Jan 2019 04:02 UTC| M 3.3 |7.6 km (4.7 mi) depth|11 km (7 mi) distance| USGS | Details
- 04 Jan 2019 13:27 UTC| M 3.3 |24.9 km (15.5 mi) depth|10 km (6 mi) distance| USGS | Details
Earlier earthquakes in the same area
Strong mag. 6.0 earthquake - 118km SE of Cold Bay, Alaska on Monday, 31 December 2018Click here to search our database for earlier earthquakes in the same area since 1900!
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