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Light mag. 4.0 earthquake - 21 Km SE of Elmendorf Air Force Base, Alaska, USA on Thursday, 15 October 2020

Light mag. 4.0 earthquake  - 21 Km SE of Elmendorf Air Force Base, Alaska, USA on Thursday, 15 October 2020
15 Oct 16:08 UTC: First to report: USGS after 3 minutes.
15 Oct 16:10: Hypocenter depth recalculated from 19.5 to 18.7 km (from 12.1 to 11.6 mi).
... [show all] ...
15 Oct 16:21: Magnitude recalculated from 4.2 to 4.0. Hypocenter depth recalculated from 16.9 to 18.1 km (from 10.5 to 11.2 mi). Epicenter location corrected by 4.4 km (2.7 mi) towards N.
Date & time: Thursday, 15 October 2020 16:05 UTC
Local time at epicenter: 15 Oct 8:05 am (GMT -8)
Magnitude: 4.0
Depth: 18.1 km
Epicenter latitude / longitude: 61.1631°N / 149.336°W (Alaska, United States)
Nearest volcano: Spurr (157 km / 98 mi)
Nearby towns and cities:
19 km (12 mi) SE of Elmendorf Air Force Base (pop: 6,600)
22 km (13 mi) SE of Eagle River (pop: 24,800)
26 km (16 mi) NW of Girdwood (pop: 2,300)
31 km (19 mi) E of Anchorage (pop: 298,700)
32 km (20 mi) NE of Hope (pop: 200)
41 km (26 mi) SE of Knik-Fairview (pop: 14,900)
Weather at epicenter at time of quake:
Clear Sky 0.7°C (33 F), humidity: 96%, wind: 0 m/s (1 kts) from E
Primary data source: USGS
Estimated released energy: 6.3 x 1010 joules (17.5 megawatt hours, equivalent to 15.1 tons of TNT) [learn more]
If you felt this quake (or if you were near the epicenter), please share your experience and submit a short "I felt it" report! Other users would love to hear about it!
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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.
TimeMag. / DepthLocationSource
15 Oct 8:05 am (GMT -8) (15 Oct 16:05:15 UTC)M 4.0 / 18.1 km21 Km SE of Elmendorf Air Force Base, Alaska, USAUSGS
Thu, 15 Oct 16:05 UTCM 4.2 / 40 kmSouthern Alaska, USAEMSC

User reports for this quake (81)

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
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1797 W River Dr, Eagle River 99577 (10.5 km NW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : I am not a light sleeper, but it woke me. I sleep on three layers of memory foam mattresses on the floor, and felt a sustained vibration — similar to old school motel room, coin-operated “1,000 Fingers “ bed massage units. Nothing fell over, but it was stronger than traffic passing in a major city. | One user found this interesting.
49 km N of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
27.9 km W of epicenter [Map] / Weak shaking (MMI III) (reported through our app)
43.7 km N of epicenter [Map] / Very weak shaking (MMI II) / very short
29.1 km W of epicenter [Map] / Very weak shaking (MMI II) / 1-2 s (reported through our app)
25.3 km W of epicenter [Map] / Moderate shaking (MMI V) / single lateral shake (reported through our app)
22.1 km WNW of epicenter [Map] / Very weak shaking (MMI II) / rattling, vibrating (reported through our app)
Eagle River (22.5 km NNW of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / 1-2 s (reported through our app)
23.5 km NNW of epicenter [Map] / Light shaking (MMI IV) (reported through our app)
Wasilla (47.2 km N of epicenter) [Map] / Light shaking (MMI IV) / single vertical bump / very short : Very quick, loud, hard bump and shake (reported through our app)
47.9 km N of epicenter [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 5-10 s
21.8 km W of epicenter [Map] / Very weak shaking (MMI II) (reported through our app)
N PARK, ANCHORAGE AK (25.8 km WNW of epicenter) [Map] / Very weak shaking (MMI II) / rattling, vibrating / very short
27.8 km W of epicenter [Map] / Very weak shaking (MMI II) / single lateral shake / very short (reported through our app)
Anchorage, AK, United States (23.9 km WSW of epicenter) [Map] / Light shaking (MMI IV) / rattling, vibrating / 2-5 s (reported through our app)
40.8 km NNW of epicenter [Map] / Light shaking (MMI IV) / horizontal (sideways) swinging / 2-5 s (reported through our app)
Palmer (51.7 km N of epicenter) [Map] / Light shaking (MMI IV) : Shook enough to wake me up. (reported through our app)
24.4 km NNW of epicenter [Map] / Weak shaking (MMI III) / rattling, vibrating / 2-5 s (reported through our app)
27.7 km NNW of epicenter [Map] / Moderate shaking (MMI V) / vibration and rolling / 5-10 s : Shhok the bed and opened a door. Lasted about 6-7 seconds.
20.5 km NW of epicenter [Map] / Light shaking (MMI IV) / 1-2 s (reported through our app)
Anchorage (Tudor and Baxter) (23.1 km W of epicenter) [Map] / Moderate shaking (MMI V) / single lateral shake / 1-2 s : Jolt, then moderate, but very short, shaking. (reported through our app)
42.9 km NNW of epicenter [Map] / not felt / single vertical bump / 1-2 s (reported through our app)
21.9 km WNW of epicenter [Map] / Moderate shaking (MMI V)
Fishhook Alaska (58.6 km N of epicenter) [Map] / Weak shaking (MMI III) / 2-5 s (reported through our app)
22.4 km NW of epicenter [Map] / Moderate shaking (MMI V) / horizontal (sideways) swinging / 20-30 s
22.9 km W of epicenter [Map] / Weak shaking (MMI III) (reported through our app)
49.7 km NNW of epicenter [Map] / Light shaking (MMI IV) / very short (reported through our app)
28.1 km W of epicenter [Map] / Very weak shaking (MMI II) / single lateral shake / very short (reported through our app)
22.7 km WNW of epicenter [Map] / Moderate shaking (MMI V) (reported through our app)
Eagle River / Light shaking (MMI IV) / 1-2 s : Two sharp shakes, only about 5 seconds apart. No warning or approaching event premonition. Dogs which usually alert immediately in advance of an event were caught off guard. No damage, but sharp enough event to cause concern it could have built to higher intensity. | 3 users found this interesting.
Anchorage / Very weak shaking (MMI II) / single lateral shake / 1-2 s : I live on in an apartment building on the top of a very steep hill. The apartment building was built here at least 30 yrs. ago, I believe. The building felt very sturdy & safe throughout the brief lateral weak shaking.
Anchorage south near Rabbit Creek and Goldenview / Strong shaking (MMI VI) : Two short sharp jolts that lifted me from a sleeping position. | 2 users found this interesting.
  • In the Muldoon area there was also a loud noise like explosion or bomb going off! We were all shaken, I didn't know what it was until my neighbors told me it was a quake!!
Anchorage / Light shaking (MMI IV) / rattling, vibrating / 5-10 s : Loud vibration then a few quick jolts. I was on the Hillside in Anchorage. | One user found this interesting.
3440 Rosella Street, Anchorage 99504 / Very weak shaking (MMI II) / 1-2 s : I heard the earthquake coming just before it struck | One user found this interesting.
Anchorage, AK / Light shaking (MMI IV) / vibration and rolling / 5-10 s
JBER / Light shaking (MMI IV) / rattling, vibrating / 2-5 s : I heard an explosion noise and then my bed continuously shook.
3440 Rosella Street, Anchorage 99504 / Very weak shaking (MMI II) / 1-2 s : I heard the earthquake coming just before it struck
Mile 5.5 Old Glenn on Knik River / Light shaking (MMI IV) / vibration and rolling
Anchorage, Alaska, Centennial Village / Light shaking (MMI IV) / rattling, vibrating / 2-5 s
Sand Lake Anchorage / Light shaking (MMI IV) / 1-2 s
Elmendorf AFB / Light shaking (MMI IV) / vertical swinging (up and down) / 2-5 s
Eagle River / Moderate shaking (MMI V) / 2-5 s
Mile 5.5 Old Glenn on Knik River / Light shaking (MMI IV) / vibration and rolling
Wasilla / Moderate shaking (MMI V)
South Anchorage / Light shaking (MMI IV)
Palmer alaska / Moderate shaking (MMI V) / rattling, vibrating / 2-5 s : Shook quick and fast
Farm Loop (United States, 50 km N of epicenter) : I hate these. Beings we live alone and me being a disabled senior and sole caretaker of my wife who's stricken with Alzheimer's and now healing from broken hip, makes my heart hurt when these come. Tests my faith and courage for sure. Last doosey we had was my birthday present November 30 last if you remember, and it gave me ptsd! That stuff is no joke! Please check on your senior family and friends often, especially those less fortunate. God Bless | 2 users found this interesting. (reported through EMSC)
Houston (United States, 55 km NW of epicenter) : True story, we just completed our earthquake drill just 5 minutes prior to this. Talk about timing. Some ppl in the hjs bldg felt it some didn't. | One user found this interesting. (reported through EMSC)
Wasilla (United States, 43 km NW of epicenter) : Heard it | One user found this interesting. (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Heard it then felt it | One user found this interesting. (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : South Anchorage. Heard the rumble, them slight wiggly jiggly. Nothing swaying afterwards. | One user found this interesting. (reported through EMSC)
Anchorage (United States of America, 31 km W of epicenter) : noise a second befor | One user found this interesting. (reported through EMSC)
Eagle River (United States, 19 km NW of epicenter) : I heard it as a sonic boom rather than felt it. A weird sound. | One user found this interesting. (reported through EMSC)
Eagle River (United States, 19 km NW of epicenter) : Felt like a mid 4.Heard it coming, then light shaking followed by a moderately strong shake, tapering off over several seconds. | One user found this interesting. (reported through EMSC)
Elmendorf Air Force Base (United States, 18 km W of epicenter) : I heard it coming, sounded like a boom, then a 4-5 second delay before a good jolt that only shook for about 5 seconds. We all felt it | One user found this interesting. (reported through EMSC)
Eagle River (United States, 19 km NW of epicenter) : I heard it before I felt it (reported through EMSC)
Palmer (United States, 46 km N of epicenter) : Woke me up (reported through EMSC)
Gateway (United States, 42 km N of epicenter) : Sitting in the car it rocked for quite a while, wasn't sure it was an earthquake or the dog. (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : I live inEagle River. How close was it to us? (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : A good solid jolt at the beginning then some rolling. Best one in a while! (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : I heard more than felt it (reported through EMSC)
Eagle River (United States, 19 km NW of epicenter) : Woke me up (reported through EMSC)
Seward (United States, 122 km S of epicenter) : Small quick shake, thought is was neighbors kid waking up and thumping (reported through EMSC)
Nikiski (United States, 121 km SW of epicenter) : Felt a quick little jolt down on the Kenai. (reported through EMSC)
Palmer (United States, 46 km N of epicenter) : Small rumble heard it then it vibrated the building I was in.. (reported through EMSC)
Gateway (United States, 42 km N of epicenter) : Started off wondering if the dog was scratching himself making the bed shake. Then there were some good jolts at the end. (reported through EMSC)
Butte (United States, 41 km N of epicenter) : Seemed bigger than a 4.2 (reported through EMSC)
Point MacKenzie (United States, 40 km NW of epicenter) : Felt 2 jiggles in point Mackenzie (reported through EMSC)
Knik-Fairview (United States of America, 38 km NW of epicenter) : 8:05 AK time. Hard, fast, short quake. Felt like a Mack truck hit the house. The whole house, doors, windows, rattled. Startled the crap out of me. (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Large shake of whole house (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Thought something hit the house (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Just a shake, lasted a little while though. (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Rattled everything in the bedroom. Small shake but lasted awhile (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Good size rattler. House was rattling. Pictures were rattling on wall. South Anchorage (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Sharp and hard, but short (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : This one shook the house for a couple of seconds! (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Lots of rattling, even the fireplace and nightstands sounded loud as it shook. Seemed like two quick large rattles and not sure if its me or the ground still rolling. (reported through EMSC)
Anchorage (United States, 31 km W of epicenter) : Pretty significant rattler. Pictures were moving on wall. Could feel the house shaking. Felt in South Anchorage (reported through EMSC)
Anchorage (United States of America, 31 km W of epicenter) : A couple pretty good jolts- enough to get an adrenaline rush. Grabbed the dogs, just in case. (reported through EMSC)
Eagle River (United States, 19 km NW of epicenter) : I felt 2 different shakes & jolts (reported through EMSC)
Eagle River (United States, 19 km NW of epicenter) : Much stronger than recent quakes!!!! Scared us! Kids took cover (reported through EMSC)

Earlier earthquakes in the same area since 1900

Light mag. 4.0 earthquake - 21 Km SE of Elmendorf Air Force Base, Alaska, USA on Thursday, 15 October 2020

Map of earlier quakes

 

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