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Strong mag. 5.1 earthquake - 145 mi east of Sand Point, Aleutians East, Alaska, USA, on 29 Jul 8:09 am (GMT -8) -

This quake was likely an aftershock of the 8.2 quake Chignik Earthquake, Gulf of Alaska, July 29, 2021 06:15 GMT, which had occurred 10 hours earlier.
Strong mag. 5.1 earthquake - 145 mi east of Sand Point, Aleutians East, Alaska, USA, on 29 Jul 8:09 am (GMT -8) Strong mag. 5.1 earthquake - 145 mi east of Sand Point, Aleutians East, Alaska, USA, on 29 Jul 8:09 am (GMT -8)

Strong magnitude 5.1 earthquake at 2 km depth

29 Jul 16:14 UTC: First to report: USGS after 6 minutes.
29 Jul 16:16: Magnitude recalculated from 5.0 to 5.3. Hypocenter depth recalculated from 74.0 to 52.3 km (from 46 to 32 mi). Epicenter location corrected by 5.9 km (3.7 mi) towards SE.
29 Jul 16:17: Magnitude recalculated from 5.3 to 5.1. Hypocenter depth recalculated from 52.3 to 1.5 km (from 32 to 0.9 mi). Epicenter location corrected by 12 km (7.2 mi) towards SSE.

Earthquake details

Date & timeJul 29, 2021 16:09:06 UTC -
Local time at epicenter29 Jul 8:09 am (GMT -8)
StatusConfirmed
Magnitude5.1
Depth1.5 km
Epicenter latitude / longitude55.1489°N / 156.8363°W (Gulf of Alaska, Alaska, United States)
Antipode55.149°S / 23.164°E
Shaking intensityStrong shaking near epicenter
Felt0 reports
Primary data sourceUSGS (United States Geological Survey)
Nearest volcanoVeniaminof (196 km / 122 mi)
Nearby towns and cities167 km (104 mi) SE of Chignik Lagoon (pop: 78) | Show on map | Quakes nearby
168 km (105 mi) ESE of Perryville (pop: 113) | Show on map | Quakes nearby
172 km (107 mi) SE of Chignik Lake (pop: 73) | Show on map | Quakes nearby
229 km (142 mi) SSE of Port Heiden (pop: 98) | Show on map | Quakes nearby
233 km (145 mi) E of Sand Point (pop: 1,060) | Show on map | Quakes nearby
260 km (161 mi) SW of Akhiok (pop: 72) | Show on map | Quakes nearby
349 km (217 mi) E of King Cove (pop: 1,010) | Show on map | Quakes nearby
381 km (237 mi) SW of Womens Bay (pop: 719) | Show on map | Quakes nearby
390 km (243 mi) SW of Kodiak Station (pop: 1,300) | Show on map | Quakes nearby
400 km (249 mi) SW of Kodiak (pop: 6,250) | Show on map | Quakes nearby
Weather at epicenter at time of quakeOvercast Clouds 11.9°C (53 F), humidity: 87%, wind: 7 m/s (13 kts) from SSW
Estimated seismic energy released2.8 x 1012 joules (783 megawatt hours, equivalent to 674 tons of TNT) | about seismic energy
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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.
Mag.DepthLocationSource
5.11.5 km161 Km SE of Chignik, AlaskaUSGS
5.510 kmSOUTH OF ALASKAEMSC
5.330 kmAlaska PeninsulaGFZ
5.310 kmNear AnchorageRENASS
5.323 kmAlaska PeninsulaGeoAu

Seismograms

Seismic station: College Outpost, Alaska, USA (COLA/IU network) | Distance from quake: 1188 km / 738 mi | Show on map | Station Info
Seismic station College Outpost, Alaska, USA: vertical movement plot around time of quake (source: IRIS/BUD)
Seismogram (vertical component) around time of quake. Thin dotted red line indicates time of quake. Seismic waves arrive some time later, depending on distance. Source: IRIS Buffer of Uniform Data (BUD) webtool
Show more

User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.
There are no user reports for this quake.

Earlier earthquakes in the same area since 1900

Date and time GMTMag
Depth
DistanceLocationDetails
Jul 29, 2021 06:15
1 year 19 weeks ago
8.2

32 km
67km / 41mi104 mi E of Sand Point, Aleutians East, Alaska, USAMore
Nov 10, 1938 20:18
84 years ago
8.2

35 km
85km / 53mi47 mi NE of Simeonof Island, Aleutians East, Alaska, USAMore
Oct 9, 1900 12:25
122 years ago
7.9

0 km
300km / 186mi10.2 mi SW of Old Harbor, Kodiak Island Borough, Alaska, USAMore
Jul 22, 2020 06:12
2 years ago
7.8

28 km
108km / 67mi31 mi E of Simeonof Island, Aleutians East, Alaska, USAMore
Oct 19, 2020 20:54
2 years ago
7.6

35 km
189km / 117mi60 mi SE of Sand Point, Aleutians East, Alaska, USAMore
May 31, 1917 08:47
106 years ago
7.4

35 km
167km / 104miLittle Koniuji Island, 50 mi SE of Sand Point, Aleutians East, Alaska, USAMore
Dec 23, 1906 17:22
116 years ago
7.3

0 km
263km / 163miKodiak Island Borough Parish, 12 mi SE of Akhiok, Kodiak Island Borough, Alaska, USAMore
Sep 4, 1989 13:14
33 years ago
7.1

11 km
44km / 27miAlaska, USAMore
Dec 6, 1999 23:12
23 years ago
7.0

44 km
288km / 179miKodiak Island Borough Parish, 32 mi W of Florida Blanca Island, Kodiak Island Borough, Alaska, USAMore
Apr 10, 1957 11:30
66 years ago
7.0

15 km
198km / 123mi145 mi SW of Kodiak, Alaska, USAMore
May 4, 1923 16:26
100 years ago
7.0

25 km
76km / 47miSouth Island, 147 mi E of Sand Point, Aleutians East, Alaska, USAMore
Jan 10, 2001 16:02
22 years ago
6.9

36 km
286km / 178mi44 mi S of Florida Blanca Island, Kodiak Island Borough, Alaska, USAMore
May 13, 1993 11:59
30 years ago
6.9

32 km
230km / 143miPopof Island, 11 mi S of Sand Point, Aleutians East, Alaska, USAMore
Feb 6, 1964 13:07
59 years ago
6.9

20 km
87km / 54miChirikof Island, 194 mi SW of Kodiak, Alaska, USAMore
Feb 13, 1951 22:13
72 years ago
6.9

20 km
81km / 50mi22 mi SE of South Island, Kodiak Island Borough, Alaska, USAMore
Nov 17, 1938 03:54
84 years ago
6.9

35 km
63km / 39mi59 mi SW of South Island, Kodiak Island Borough, Alaska, USAMore
Jun 19, 1986 09:09
36 years ago
6.8

17 km
279km / 173mi103 mi S of Kodiak, Alaska, USAMore
Apr 4, 1964 17:46
59 years ago
6.8

18 km
199km / 124mi14 mi SE of Tugidak Island, Kodiak Island Borough, Alaska, USAMore
Nov 29, 1952 23:46
70 years ago
6.8

20 km
216km / 134mi17 mi S of Sitkinak Island, Kodiak Island Borough, Alaska, USAMore
May 13, 1910 07:58
113 years ago
6.8

100 km
284km / 177mi117 mi N of Sand Point, Aleutians East, Alaska, USAMore
May 29, 2015 07:00
8 years ago
6.7

56 km
162km / 101mi21 mi SE of Ugaiushak Island, Lake and Peninsula, Alaska, USAMore
Feb 13, 1979 05:34
44 years ago
6.7

33 km
40km / 25mi40 mi SW of South Island, Kodiak Island Borough, Alaska, USAMore
Jul 28, 1934 21:37
88 years ago
6.7

20 km
59km / 36mi22 mi S of South Island, Kodiak Island Borough, Alaska, USAMore
Oct 9, 1985 09:33
37 years ago
6.6

30 km
182km / 113mi53 mi SE of Sand Point, Aleutians East, Alaska, USAMore
Mar 28, 1964 12:20
59 years ago
6.6

25 km
218km / 136mi14 mi S of Sitkinak Island, Kodiak Island Borough, Alaska, USAMore
Nov 11, 1938 00:57
84 years ago
6.6

35 km
119km / 74mi24 mi E of Simeonof Island, Aleutians East, Alaska, USAMore
Oct 16, 1932 12:08
90 years ago
6.6

25 km
179km / 111mi49 mi SE of Sand Point, Aleutians East, Alaska, USAMore
Jul 11, 2000 01:32
22 years ago
6.5

43 km
295km / 183miKodiak Island Borough Parish, 27 mi W of Florida Blanca Island, Kodiak Island Borough, Alaska, USAMore
Sep 12, 1986 23:57
36 years ago
6.5

31 km
245km / 152mi116 mi S of Kodiak, Alaska, USAMore
Feb 14, 1983 03:20
40 years ago
6.5

47 km
152km / 94miSimeonof Island, 59 mi SE of Sand Point, Aleutians East, Alaska, USAMore
Jul 1, 1967 23:10
55 years ago
6.5

28 km
119km / 74mi117 mi SE of Sand Point, Aleutians East, Alaska, USAMore
Jun 23, 1965 11:09
57 years ago
6.5

20 km
288km / 179mi35 mi SE of Nasikan Island, Kodiak Island Borough, Alaska, USAMore
Apr 4, 1964 17:59
59 years ago
6.5

25 km
209km / 130miTrinity Islands, 35 mi S of Akhiok, Kodiak Island Borough, Alaska, USAMore
Mar 28, 1964 14:46
59 years ago
6.5

25 km
206km / 128mi20 mi S of Sitkinak Island, Kodiak Island Borough, Alaska, USAMore
Dec 7, 1999 00:19
23 years ago
6.4

44 km
279km / 173miKodiak Island Borough Parish, 32 mi SW of Florida Blanca Island, Kodiak Island Borough, Alaska, USAMore
May 20, 1979 08:14
44 years ago
6.4

71 km
167km / 104miUgaiushak Island, 180 mi SW of Kodiak, Alaska, USAMore
Mar 24, 1972 03:38
51 years ago
6.4

68 km
110km / 68mi22 mi NW of South Island, Kodiak Island Borough, Alaska, USAMore
Apr 2, 2016 05:50
7 years ago
6.2

10 km
238km / 148mi29 mi NE of Port Heiden, Lake and Peninsula, Alaska, USAMore
May 25, 1993 23:16
30 years ago
6.2

37 km
234km / 146mi22 mi S of Sand Point, Aleutians East, Alaska, USAMore
Jul 29, 2021 06:19
1 year 19 weeks ago
6.1

27 km
83km / 52mi95 mi E of Sand Point, Aleutians East, Alaska, USAMore
Jul 22, 2020 06:16
2 years ago
6.1

18 km
143km / 89miSimeonof Island, 64 mi SE of Sand Point, Aleutians East, Alaska, USAMore
May 29, 1990 18:31
33 years ago
6.1

25 km
286km / 177miNasikan Island, 72 mi SW of Kodiak, Alaska, USAMore
Nov 14, 1985 22:17
37 years ago
6.1

33 km
193km / 120mi49 mi SE of Sand Point, Aleutians East, Alaska, USAMore
May 25, 2008 19:18
15 years ago
6.0

20 km
226km / 140mi60 mi SE of Tugidak Island, Kodiak Island Borough, Alaska, USAMore
Feb 22, 1989 10:25
34 years ago
6.0

33 km
229km / 143mi122 mi S of Kodiak, Alaska, USAMore
Jan 2, 1985 05:32
38 years ago
6.0

33 km
70km / 44mi57 mi SW of South Island, Kodiak Island Borough, Alaska, USAMore
Apr 6, 1974 03:56
49 years ago
6.0

40 km
229km / 142miShumagin Islands, 15 mi S of Sand Point, Aleutians East, Alaska, USAMore
Mar 11, 1970 22:38
53 years ago
6.0

39 km
303km / 189miKodiak Island Borough Parish, 21 mi W of Florida Blanca Island, Kodiak Island Borough, Alaska, USAMore
Jul 29, 2021 06:23
1 year 19 weeks ago
5.9

5.3 km
43km / 27mi124 mi E of Sand Point, Aleutians East, Alaska, USAMore
Jan 5, 2007 16:52
16 years ago
5.8

4.9 km
79km / 49miAlaska, USAMore
Sep 27, 1992 17:48
30 years ago
5.8

33 km
138km / 86mi161 mi SE of Sand Point, Aleutians East, Alaska, USAMore
Feb 21, 1972 19:34
51 years ago
5.8

54 km
125km / 78mi37 mi SW of Nakchamik Island, Lake and Peninsula, Alaska, USAMore
Jul 22, 2020 06:20
2 years ago
5.7

26 km
141km / 88mi19 mi SE of Simeonof Island, Aleutians East, Alaska, USAMore
May 31, 2016 20:51
7 years ago
5.7

39 km
112km / 70mi40 mi SE of Perryville, Lake and Peninsula, Alaska, USAMore
May 29, 1955 21:03
68 years ago
5.7

15 km
155km / 96mi175 mi SW of Kodiak, Alaska, USAMore
Feb 7, 1996 21:19
27 years ago
5.6

20 km
26km / 16miAlaska, USAMore
Jun 22, 1970 14:39
52 years ago
5.6

25 km
18km / 11mi154 mi E of Sand Point, Aleutians East, Alaska, USAMore
Apr 6, 1966 22:28
57 years ago
5.6

26 km
196km / 122miTugidak Island, 42 mi SW of Akhiok, Kodiak Island Borough, Alaska, USAMore
Jul 29, 2021 06:32
1 year 19 weeks ago
5.5

10 km
37km / 23mi164 mi E of Sand Point, Aleutians East, Alaska, USAMore
Dec 7, 2013 16:44
9 years ago
5.5

13 km
64km / 39mi105 mi E of Sand Point, Aleutians East, Alaska, USAMore
Mar 10, 2012 14:10
11 years ago
5.5

44 km
41km / 26mi129 mi E of Sand Point, Aleutians East, Alaska, USAMore
May 28, 1993 15:55
30 years ago
5.5

33 km
132km / 82mi18 mi E of Chirikof Island, Kodiak Island Borough, Alaska, USAMore
Apr 16, 1993 04:09
30 years ago
5.5

25 km
161km / 100mi27 mi SW of Tugidak Island, Kodiak Island Borough, Alaska, USAMore
Feb 24, 1972 01:43
51 years ago
5.5

59 km
116km / 72mi37 mi S of Nakchamik Island, Lake and Peninsula, Alaska, USAMore
Sep 8, 1965 11:16
57 years ago
5.5

24 km
115km / 72mi15 mi SE of Chirikof Island, Kodiak Island Borough, Alaska, USAMore
Jan 1, 1991 15:50
32 years ago
5.4

33 km
99km / 61mi39 mi NE of Simeonof Island, Aleutians East, Alaska, USAMore
Aug 18, 2020 18:28
2 years ago
5.3

5 km
78km / 49mi96 mi E of Sand Point, Aleutians East, Alaska, USAMore
Aug 8, 2020 12:52
2 years ago
5.3

25 km
99km / 61mi96 mi E of Sand Point, Aleutians East, Alaska, USAMore
Aug 9, 2020 14:57
2 years ago
5.2

33 km
72km / 45mi102 mi E of Sand Point, Aleutians East, Alaska, USAMore
Jul 4, 2011 21:01
11 years ago
5.2

12 km
61km / 38mi107 mi E of Sand Point, Aleutians East, Alaska, USAMore
Dec 19, 2004 22:39
18 years ago
5.2

10 km
65km / 41mi58 mi E of Simeonof Island, Aleutians East, Alaska, USAMore
Apr 19, 1988 22:05
35 years ago
5.2

77 km
147km / 91mi29 mi NE of Semidi s Island, Kodiak Island Borough, Alaska, USAMore
Apr 21, 1985 15:25
38 years ago
5.2

33 km
156km / 97mi170 mi SW of Kodiak, Alaska, USAMore
Jan 7, 2006 18:55
17 years ago
5.1

47 km
105km / 65mi15 mi NW of South Island, Kodiak Island Borough, Alaska, USAMore
May 5, 2001 05:48
22 years ago
5.1

44 km
125km / 78mi18 mi NE of Semidi s Island, Kodiak Island Borough, Alaska, USAMore
Jan 25, 1995 10:27
28 years ago
5.1

33 km
49km / 31mi57 mi SW of South Island, Kodiak Island Borough, Alaska, USAMore
Sep 5, 1994 02:59
28 years ago
5.1

62 km
137km / 85mi34 mi SW of Nakchamik Island, Lake and Peninsula, Alaska, USAMore
Nov 20, 1983 08:29
39 years ago
5.1

33 km
75km / 46mi59 mi NE of Simeonof Island, Aleutians East, Alaska, USAMore
Aug 15, 1981 10:30
41 years ago
5.1

53 km
137km / 85miAlaska, USAMore
Feb 12, 1979 15:44
44 years ago
5.1

33 km
45km / 28mi38 mi SW of South Island, Kodiak Island Borough, Alaska, USAMore
Mar 16, 1977 06:22
46 years ago
5.1

18 km
40km / 25mi36 mi S of South Island, Kodiak Island Borough, Alaska, USAMore
Jan 17, 1977 09:42
46 years ago
5.1

22 km
168km / 104mi137 mi SE of Sand Point, Aleutians East, Alaska, USAMore
Jul 29, 2021 09:55
1 year 19 weeks ago
5.0

10 km
77km / 48miUSAMore
Aug 18, 2020 18:28
2 years ago
5.0

42 km
71km / 44mi105 mi E of Sand Point, Aleutians East, Alaska, USAMore
Jul 30, 2020 16:08
2 years ago
5.0

1.8 km
93km / 58mi43 mi E of Simeonof Island, Aleutians East, Alaska, USAMore
Oct 10, 2018 06:27
4 years ago
5.0

42 km
140km / 87mi22 mi SE of Perryville, Lake and Peninsula, Alaska, USAMore
Feb 23, 2018 03:31
5 years ago
5.0

28 km
133km / 83mi29 mi SE of Perryville, Lake and Peninsula, Alaska, USAMore
Jan 7, 2007 15:33
16 years ago
5.0

24 km
62km / 38mi95 mi SW of Chirikof Island, Kodiak Island Borough, Alaska, USAMore
Jan 24, 2001 17:47
22 years ago
5.0

22 km
43km / 26miAlaska, USAMore
Oct 24, 1994 17:01
28 years ago
5.0

33 km
17km / 10mi68 mi S of South Island, Kodiak Island Borough, Alaska, USAMore
Dec 22, 1991 21:55
31 years ago
5.0

36 km
139km / 86mi30 mi N of Chirikof Island, Kodiak Island Borough, Alaska, USAMore
Apr 15, 1985 04:07
38 years ago
5.0

33 km
22km / 14mi50 mi S of South Island, Kodiak Island Borough, Alaska, USAMore
Jul 21, 1982 23:37
40 years ago
5.0

33 km
22km / 14mi72 mi S of South Island, Kodiak Island Borough, Alaska, USAMore
Feb 13, 1979 11:35
44 years ago
5.0

33 km
33km / 21mi41 mi S of South Island, Kodiak Island Borough, Alaska, USAMore
Sep 25, 2020 05:57
2 years ago
4.9

10 km
76km / 47mi100 mi E of Sand Point, Aleutians East, Alaska, USAMore
Nov 7, 2019 21:48
3 years ago
4.9

36 km
74km / 46mi102 mi E of Sand Point, Aleutians East, Alaska, USAMore
Jul 24, 2018 04:17
4 years ago
4.9

13 km
58km / 36mi109 mi E of Sand Point, Aleutians East, Alaska, USAMore
Oct 12, 2017 00:01
5 years ago
4.9

8.7 km
53km / 33miNorth Pacific Ocean, 249 mi SW of Kodiak, Alaska, USAMore
Feb 27, 2017 16:07
6 years ago
4.9

10 km
127km / 79mi27 mi E of Perryville, Lake and Peninsula, Alaska, USAMore
Apr 2, 2011 18:32
12 years ago
4.9

24 km
92km / 57miSouth Island, 211 mi SW of Kodiak, Alaska, USAMore
Show all

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