Earthquakes on October 4, 2021
299
EARTHQUAKES on October 4, 2021
24-hour UTC period · USGS data
LARGEST: M6.2 — South Sandwich Islands region
10 km deep · 3 people felt it
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
6
M4.0–4.9
36
M3.0–3.9
7
M2.0–2.9
62
M1.0–1.9
188
Activity Summary
299
Total earthquakes
~250
Daily average
Normal
Activity level
6
M5.0+ events
Geographic Breakdown
Top Countries (International)
Significant Earthquakes (M4.5+)
6.2
South Sandwich Islands region
03:54 UTC · 10.0 km deep
Felt by 3
5.7
Kermadec Islands, New Zealand
06:34 UTC · 27.7 km deep
5.5
61 km NE of Masjed Soleym?n, Iran
02:39 UTC · 13.0 km deep
Felt by 25
5.1
South Sandwich Islands region
14:51 UTC · 10.0 km deep
5.1
80 km ESE of Amahai, Indonesia
14:28 UTC · 21.6 km deep
Felt by 1
5.1
Prince Edward Islands region
04:12 UTC · 10.0 km deep
4.9
86 km WNW of Tari, Papua New Guinea
19:06 UTC · 49.4 km deep
4.9
south of the Fiji Islands
18:32 UTC · 528.2 km deep
Earthquake Map — October 4, 2021
All Earthquakes — October 4, 2021
Showing 30 of 111 (filtered from 299)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-10-04 2021-10-04 23:57:37 UTC | 2.2ml | 35 km SSE of Goldfield, Nevada 37.401°, -117.133° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
At 23:57 UTC on October 4, 2021, a magnitude 2.2 tremor occurred 35 km SSE of Goldfield, Nevada. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 23:38:47 UTC | 2.3ml | 25 km SSE of Mammoth, Wyoming 44.754°, -110.627° | 4.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place 25 km SSE of Mammoth, Wyoming on October 4, 2021 at 23:38 UTC. It arrived roughly 1 hours after a larger magnitude 2.5 mainshock in the same 20 km area, placing it within the typical aftershock window. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 23:18:56 UTC | 2.5ml | 95 km ESE of Yakutat, Alaska 59.207°, -138.189° | 8.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 earthquake was recorded 95 km ESE of Yakutat, Alaska on October 4, 2021 at 23:18 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 23:07:48 UTC | 3.7ml | 14km WNW of Pinnacles, CA 36.589°, -121.289° | 6.4 km | 531 | IV | - | ✓ Reviewed | USGS → |
At 23:07 UTC on October 4, 2021, a magnitude 3.7 tremor occurred 14km WNW of Pinnacles, CA. See the M3.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 22:43:18 UTC | 2.4ml | 10 km WNW of Stanley, Idaho 44.269°, -115.046° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 10 km WNW of Stanley, Idaho came in on October 4, 2021 at 22:43 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 19 hours earlier. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 22:41:23 UTC | 2.2ml | 24 km SSE of Mammoth, Wyoming 44.762°, -110.632° | 2.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 24 km SSE of Mammoth, Wyoming at 22:41 UTC on October 4, 2021. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 1 hours earlier. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 22:41:03 UTC | 2.0ml | 24 km SSE of Mammoth, Wyoming 44.758°, -110.631° | 3.5 km | - | - | - | ✓ Reviewed | USGS → |
On October 4, 2021 at 22:41 UTC, a magnitude 2.0 earthquake struck 24 km SSE of Mammoth, Wyoming. This event falls inside the aftershock decay of a nearby magnitude 2.5 earthquake that occurred about 1 hours earlier. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 22:39:56 UTC | 2.4ml | 25 km SSE of Mammoth, Wyoming 44.751°, -110.627° | 4.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.4 earthquake 25 km SSE of Mammoth, Wyoming at 22:39 UTC on October 4, 2021. Coming 1 hours after a magnitude 2.5 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 22:38:13 UTC | 2.3ml | 56 km NE of Kobuk, Alaska 67.324°, -156.151° | 14.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake 56 km NE of Kobuk, Alaska at 22:38 UTC on October 4, 2021. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 22:37:02 UTC | 2.5ml | Wyoming 44.754°, -110.625° | 4.3 km | - | - | - | ✓ Reviewed | USGS → |
At 22:37 UTC on October 4, 2021, a magnitude 2.5 tremor occurred near Wyoming. In the 72 hours after this event, the USGS recorded 10 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 22:36:12 UTC | 2.4ml | 8 km NNE of Helena Valley Northwest, Montana 46.803°, -112.016° | 6.3 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 8 km NNE of Helena Valley Northwest, Montana on October 4, 2021 at 22:36 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 22:03:44 UTC | 2.0md | 29km SSW of Smith Valley, NV 38.527°, -119.413° | 2.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 29km SSW of Smith Valley, NV on October 4, 2021 at 22:03 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 21:45:30 UTC | 4.4mb | 22 km SE of Rust?q, Afghanistan 36.975°, 69.996° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
October 4, 2021 brought a magnitude 4.4 earthquake 22 km SE of Rust?q, Afghanistan, logged at 21:45 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 21:33:20 UTC | 3.2ml | 55 km S of Whites City, New Mexico 31.682°, -104.436° | 6.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.2 earthquake 55 km S of Whites City, New Mexico came in on October 4, 2021 at 21:33 UTC. The event was offshore. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 21:32:36 UTC | 4.7mb | 35 km ENE of Yuyapichis, Peru -9.490°, -74.686° | 116.9 km | - | - | - | ✓ Reviewed | USGS → |
At 21:32 UTC on October 4, 2021, a magnitude 4.7 tremor occurred 35 km ENE of Yuyapichis, Peru. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 21:31:53 UTC | 4.3mb | 0 km WSW of Ramos West, Philippines 16.696°, 121.609° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake 0 km WSW of Ramos West, Philippines came in on October 4, 2021 at 21:31 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 21:16:49 UTC | 4.2mb | South Sandwich Islands region -58.813°, -23.974° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
October 4, 2021 brought a magnitude 4.2 earthquake in the South Sandwich Islands region, logged at 21:16 UTC. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 21:07:58 UTC | 2.8md | 22 km SSW of Guánica, Puerto Rico 17.780°, -66.968° | 4.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.8 earthquake 22 km SSW of Guánica, Puerto Rico with origin time 21:07 UTC on October 4, 2021. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 21:06:32 UTC | 4.5mb | 69 km ESE of Ishinomaki, Japan 38.160°, 142.023° | 45.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.5 event was detected 69 km ESE of Ishinomaki, Japan on October 4, 2021, with origin time 21:06 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:58:22 UTC | 2.3ml | 83 km E of Denali Park, Alaska 63.597°, -147.258° | 12.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 83 km E of Denali Park, Alaska on October 4, 2021, with origin time 20:58 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.4 earthquake that occurred about 1 hours earlier. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:51:48 UTC | 2.9ml | 188 km SSE of Unalaska, Alaska 52.472°, -164.963° | 42.0 km | - | - | - | ✓ Reviewed | USGS → |
October 4, 2021 brought a magnitude 2.9 earthquake 188 km SSE of Unalaska, Alaska, logged at 20:51 UTC. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:44:42 UTC | 2.1ml | 37 km SSE of Goldfield, Nevada 37.389°, -117.115° | 5.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 37 km SSE of Goldfield, Nevada with origin time 20:44 UTC on October 4, 2021. In the 72 hours after this event, the USGS recorded 7 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:40:04 UTC | 4.4mb | 264 km W of Tual, Indonesia -6.094°, 130.414° | 133.6 km | - | - | - | ✓ Reviewed | USGS → |
On October 4, 2021 at 20:40 UTC, a magnitude 4.4 earthquake struck 264 km W of Tual, Indonesia. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:38:26 UTC | 2.4ml | 82 km ESE of Denali Park, Alaska 63.596°, -147.271° | 12.6 km | - | - | - | ✓ Reviewed | USGS → |
October 4, 2021 brought a magnitude 2.4 earthquake 82 km ESE of Denali Park, Alaska, logged at 20:38 UTC. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:31:29 UTC | 4.1mb | Kermadec Islands region -31.823°, -179.914° | 329.1 km | - | - | - | ✓ Reviewed | USGS → |
On October 4, 2021 at 20:31 UTC, a magnitude 4.1 earthquake struck in the Kermadec Islands region. This deep-focus earthquake originated far below the brittle crust, deep inside the mantle. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:21:37 UTC | 2.4ml | 54 km NW of Toyah, Texas 31.606°, -104.256° | 6.2 km | - | - | - | ✓ Reviewed | USGS → |
On October 4, 2021 at 20:21 UTC, a magnitude 2.4 earthquake struck 54 km NW of Toyah, Texas. This event falls inside the aftershock decay of a nearby magnitude 2.9 earthquake that occurred about 15 hours earlier. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:16:08 UTC | 2.0ml | 14 km SSE of Sunnyside, Utah 39.431°, -110.308° | -1.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 14 km SSE of Sunnyside, Utah on October 4, 2021 at 20:16 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 20:12:02 UTC | 4.6mb | 29 km WNW of Bulata, Philippines 9.944°, 122.149° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.6 seismic event took place 29 km WNW of Bulata, Philippines on October 4, 2021 at 20:12 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 19:57:55 UTC | 2.1ml | 55 km SE of Perryville, Alaska 55.546°, -158.552° | 13.7 km | - | - | - | ✓ Reviewed | USGS → |
On October 4, 2021, worldwide seismic activity registered a magnitude 2.1 earthquake 55 km SE of Perryville, Alaska at 19:57 UTC. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-10-04 2021-10-04 19:37:14 UTC | 2.2ml | 6 km NW of Stanley, Idaho 44.250°, -115.001° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 seismic event took place 6 km NW of Stanley, Idaho on October 4, 2021 at 19:37 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 16 hours earlier. The event was offshore. See the M2.2 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 4, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.