Earthquakes on October 15, 2021
321
EARTHQUAKES on October 15, 2021
24-hour UTC period · USGS data
33 km deep · 23 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
42
M3.0–3.9
14
M2.0–2.9
53
M1.0–1.9
210
Activity Summary
321
Total earthquakes
~250
Daily average
Elevated
Activity level
2
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
6.4
148 km WSW of Buala, Solomon Islands
02:44 UTC · 33.0 km deep
Felt by 23
5.0
103 km SSW of Pagar Alam, Indonesia
23:17 UTC · 59.4 km deep
4.9
3 km WNW of Marihatag, Philippines
16:54 UTC · 68.0 km deep
Felt by 2
4.7
Mariana Islands region
22:08 UTC · 10.1 km deep
4.7
18 km NNE of Banjar Wangsian, Indonesia
20:18 UTC · 10.0 km deep
Felt by 91
4.7
12 km ENE of Laela, Tanzania
05:49 UTC · 10.0 km deep
Felt by 2
4.6
108 km NE of Savannah Bight, Honduras
18:44 UTC · 10.0 km deep
Felt by 1
4.6
Kermadec Islands, New Zealand
00:59 UTC · 87.2 km deep
Earthquake Map — October 15, 2021
All Earthquakes — October 15, 2021
Showing 30 of 111 (filtered from 321)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-10-15 2021-10-15 23:58:28 UTC | 2.5ml | 119 km E of Chignik, Alaska 56.293°, -156.476° | 71.1 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2021, worldwide seismic activity registered a magnitude 2.5 earthquake 119 km E of Chignik, Alaska at 23:58 UTC. It arrived roughly 7 hours after a larger magnitude 3.3 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 23:25:42 UTC | 4.2mb | 37 km SSE of Palekastro, Greece 34.874°, 26.349° | 10.0 km | 2 | - | - | ✓ Reviewed | USGS → |
On October 15, 2021, worldwide seismic activity registered a magnitude 4.2 earthquake 37 km SSE of Palekastro, Greece at 23:25 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 23:17:27 UTC | 5.0mb | 103 km SSW of Pagar Alam, Indonesia -4.920°, 102.979° | 59.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 5.0 earthquake was recorded 103 km SSW of Pagar Alam, Indonesia on October 15, 2021 at 23:17 UTC. See the M5.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 23:14:29 UTC | 4.3mb | 31 km ESE of Hihifo, Tonga -16.081°, -173.530° | 107.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake 31 km ESE of Hihifo, Tonga at 23:14 UTC on October 15, 2021. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 23:03:41 UTC | 4.3mb | 202 km WSW of Labuan, Indonesia -6.984°, 104.104° | 22.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.3 event was detected 202 km WSW of Labuan, Indonesia on October 15, 2021, with origin time 23:03 UTC. Coming 2 hours after a magnitude 4.4 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 23:02:46 UTC | 4.2mb | 40 km S of La Libertad, El Salvador 13.122°, -89.284° | 52.6 km | 2 | - | - | ✓ Reviewed | USGS → |
At 23:02 UTC on October 15, 2021, a magnitude 4.2 tremor occurred 40 km S of La Libertad, El Salvador. The event was offshore. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 23:02:03 UTC | 2.3ml | south of Alaska 54.742°, -159.632° | 11.6 km | - | - | - | ✓ Reviewed | USGS → |
At 23:02 UTC on October 15, 2021, a magnitude 2.3 tremor occurred south of Alaska. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 22:44:42 UTC | 4.4mb | 109 km E of Barcelona, Philippines 8.244°, 127.422° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected 109 km E of Barcelona, Philippines on October 15, 2021, with origin time 22:44 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 22:38:34 UTC | 4.3mb | 56 km NNE of Singaraja, Indonesia -7.674°, 115.354° | 286.8 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake 56 km NNE of Singaraja, Indonesia came in on October 15, 2021 at 22:38 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 22:08:43 UTC | 4.7mb | Mariana Islands region 12.810°, 147.936° | 10.1 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2021, worldwide seismic activity registered a magnitude 4.7 earthquake in the Mariana Islands region at 22:08 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 21:46:37 UTC | 4.3mb | south of the Fiji Islands -23.865°, -179.787° | 550.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.3 seismic event took place south of the Fiji Islands on October 15, 2021 at 21:46 UTC. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 21:38:26 UTC | 2.0ml | 73 km SSE of Akutan, Alaska 53.541°, -165.301° | 48.9 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 73 km SSE of Akutan, Alaska at 21:38 UTC on October 15, 2021. It arrived roughly 1 hours after a larger magnitude 2.1 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 21:36:52 UTC | 2.1ml | 74 km SSE of Akutan, Alaska 53.524°, -165.320° | 48.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 74 km SSE of Akutan, Alaska at 21:36 UTC on October 15, 2021. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 21:30:02 UTC | 4.3mb | Fiji region -21.497°, -178.786° | 589.4 km | - | - | - | ✓ Reviewed | USGS → |
October 15, 2021 brought a magnitude 4.3 earthquake in the Fiji region, logged at 21:30 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 21:12:44 UTC | 4.5mb | 86 km SE of Pangai, Tonga -20.266°, -173.683° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place 86 km SE of Pangai, Tonga on October 15, 2021 at 21:12 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 21:07:48 UTC | 2.1md | 24km NE of King City, CA 36.358°, -120.935° | 7.8 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 24km NE of King City, CA at 21:07 UTC on October 15, 2021. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 20:39:29 UTC | 4.2mb | 31 km SSW of Naisano Dua, Indonesia -9.851°, 123.638° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.2 earthquake 31 km SSW of Naisano Dua, Indonesia at 20:39 UTC on October 15, 2021. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 20:34:06 UTC | 4.4mb | 209 km WSW of Labuan, Indonesia -7.157°, 104.099° | 36.7 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 209 km WSW of Labuan, Indonesia came in on October 15, 2021 at 20:34 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 20:18:21 UTC | 4.7mww | 18 km NNE of Banjar Wangsian, Indonesia -8.328°, 115.465° | 10.0 km | 91 | - | - | ✓ Reviewed | USGS → |
At 20:18 UTC on October 15, 2021, a magnitude 4.7 tremor occurred 18 km NNE of Banjar Wangsian, Indonesia. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 20:13:09 UTC | 2.8ml | 85 km ESE of Adak, Alaska 51.695°, -175.427° | 51.7 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2021 at 20:13 UTC, a magnitude 2.8 earthquake struck 85 km ESE of Adak, Alaska. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 19:54:58 UTC | 3.6md | 108 km NNW of Charlotte Amalie, U.S. Virgin Islands 19.296°, -65.158° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.6 earthquake 108 km NNW of Charlotte Amalie, U.S. Virgin Islands with origin time 19:54 UTC on October 15, 2021. See the M3.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 19:54:07 UTC | 3.0ml | 14km N of Cloverdale, CA 38.929°, -123.035° | 4.4 km | 43 | - | - | ✓ Reviewed | USGS → |
A magnitude 3.0 seismic event took place 14km N of Cloverdale, CA on October 15, 2021 at 19:54 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 19:48:34 UTC | 4.5mb | 127 km SW of Singkil, Indonesia 1.409°, 97.043° | 28.4 km | - | - | - | ✓ Reviewed | USGS → |
October 15, 2021 brought a magnitude 4.5 earthquake 127 km SW of Singkil, Indonesia, logged at 19:48 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 19:37:23 UTC | 2.1ml | 51 km NW of Toyah, Texas 31.603°, -104.219° | 6.2 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 51 km NW of Toyah, Texas on October 15, 2021, with origin time 19:37 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 19:32:21 UTC | 2.1ml | 31 km SE of Mina, Nevada 38.160°, -117.899° | 10.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 31 km SE of Mina, Nevada came in on October 15, 2021 at 19:32 UTC. It arrived roughly 7 hours after a larger magnitude 3.7 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 19:19:28 UTC | 2.2md | 4 km SSE of P?hala, Hawaii 19.163°, -155.464° | 32.4 km | - | - | - | Auto | USGS → |
A magnitude 2.2 earthquake was recorded 4 km SSE of P?hala, Hawaii on October 15, 2021 at 19:19 UTC. It arrived roughly 9 hours after a larger magnitude 3.6 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 18:55:48 UTC | 2.9ml | 139 km W of Adak, Alaska 51.883°, -178.663° | 23.8 km | - | - | - | ✓ Reviewed | USGS → |
October 15, 2021 brought a magnitude 2.9 earthquake 139 km W of Adak, Alaska, logged at 18:55 UTC. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 18:46:40 UTC | 3.2ml | 63 km ESE of Denali National Park, Alaska 63.245°, -150.630° | 128.3 km | - | - | - | ✓ Reviewed | USGS → |
At 18:46 UTC on October 15, 2021, a magnitude 3.2 tremor occurred 63 km ESE of Denali National Park, Alaska. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 18:44:34 UTC | 4.6mb | 108 km NE of Savannah Bight, Honduras 17.166°, -85.149° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
This magnitude 4.6 event was detected 108 km NE of Savannah Bight, Honduras on October 15, 2021, with origin time 18:44 UTC. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-15 2021-10-15 18:38:34 UTC | 4.5mb | 53 km ENE of Isangel, Vanuatu -19.334°, 169.739° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On October 15, 2021 at 18:38 UTC, a magnitude 4.5 earthquake struck 53 km ENE of Isangel, Vanuatu. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
Legend:
Mag: Magnitude (magType = ml, mb, mw, etc.)
Felt: Number of DYFI felt reports
MMI: Modified Mercalli Intensity (I-X+)
Alert: PAGER alert level
Depth: Shallow (<70km), Intermediate, Deep (>300km)
Status: Auto = preliminary, Reviewed = verified by seismologist
Click any row to see additional technical details.
About This Page
This page shows all earthquakes recorded by the USGS Earthquake Hazards Program during the 24-hour UTC period on October 15, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.