Earthquakes on July 31, 2021
355
EARTHQUAKES on July 31, 2021
24-hour UTC period · USGS data
10 km deep · 25 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
28
M3.0–3.9
26
M2.0–2.9
89
M1.0–1.9
208
Activity Summary
355
Total earthquakes
~250
Daily average
Elevated
Activity level
4
M5.0+ events
Significant Earthquakes (M4.5+)
5.5
60 km SW of San Carlos, Mexico
15:39 UTC · 10.0 km deep
Felt by 25
5.2
17 km W of Bavispe, Mexico
21:19 UTC · 10.0 km deep
Felt by 64
5.0
76 km WSW of Port-Olry, Vanuatu
08:05 UTC · 10.0 km deep
Felt by 1
5.0
16 km NNE of T?betsu, Japan
05:26 UTC · 167.8 km deep
Felt by 2
4.8
41 km NNW of Valparaíso, Chile
12:14 UTC · 25.7 km deep
Felt by 78
4.8
New Siberian Islands, Sakha, Russia
00:31 UTC · 10.0 km deep
4.7
23 km SSW of Mandráki, Greece
19:57 UTC · 11.0 km deep
Felt by 1
4.7
8 km SW of Anan, Japan
04:09 UTC · 41.4 km deep
Felt by 1
Earthquake Map — July 31, 2021
All Earthquakes — July 31, 2021
Showing 30 of 147 (filtered from 355)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-07-31 2021-07-31 23:59:34 UTC | 4.6mb | northern Mid-Atlantic Ridge 31.521°, -40.794° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
July 31, 2021 brought a magnitude 4.6 earthquake near northern Mid-Atlantic Ridge, logged at 23:59 UTC. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 23:57:39 UTC | 2.6ml | 115 km ESE of Chignik, Alaska 55.783°, -156.789° | 4.9 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2021, worldwide seismic activity registered a magnitude 2.6 earthquake 115 km ESE of Chignik, Alaska at 23:57 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 23:57:09 UTC | 2.1md | 6 km NNW of Mascot, Tennessee 36.114°, -83.772° | 16.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 6 km NNW of Mascot, Tennessee on July 31, 2021 at 23:57 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 23:41:21 UTC | 4.3mb | 45 km SE of Kifr?, Iraq 34.418°, 45.333° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.3 earthquake 45 km SE of Kifr?, Iraq with origin time 23:41 UTC on July 31, 2021. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 23:40:15 UTC | 4.6mb | 187 km SW of Merizo Village, Guam 11.998°, 143.521° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2021 at 23:40 UTC, a magnitude 4.6 earthquake struck 187 km SW of Merizo Village, Guam. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 23:26:01 UTC | 4.4mb | 275 km E of Levuka, Fiji -18.273°, -178.084° | 577.2 km | 1 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 275 km E of Levuka, Fiji came in on July 31, 2021 at 23:26 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 23:25:41 UTC | 4.4mb | 32 km S of Mandráki, Greece 36.327°, 27.064° | 10.0 km | 1 | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 seismic event took place 32 km S of Mandráki, Greece on July 31, 2021 at 23:25 UTC. It arrived roughly 3 hours after a larger magnitude 4.7 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 23:20:58 UTC | 2.8ml | 54 km NW of Toyah, Texas 31.608°, -104.258° | 7.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 earthquake was recorded 54 km NW of Toyah, Texas on July 31, 2021 at 23:20 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.4 earthquake that occurred about 3 hours earlier. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 23:10:21 UTC | 2.2ml | 8 km ENE of P?hala, Hawaii 19.222°, -155.398° | 32.3 km | - | - | - | Auto | USGS → |
Seismographs logged a magnitude 2.2 earthquake 8 km ENE of P?hala, Hawaii with origin time 23:10 UTC on July 31, 2021. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 8 hours earlier. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 22:55:21 UTC | 3.1ml | 20 km WSW of Coyanosa, Texas 31.149°, -103.252° | 3.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 3.1 seismic event took place 20 km WSW of Coyanosa, Texas on July 31, 2021 at 22:55 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 22:47:58 UTC | 2.0ml | 49 km NW of Stevens Village, Alaska 66.288°, -149.924° | 14.5 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 49 km NW of Stevens Village, Alaska came in on July 31, 2021 at 22:47 UTC. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 22:43:01 UTC | 3.9mb | 3 km NNW of Fochville, South Africa -26.465°, 27.477° | 5.0 km | 13 | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.9 earthquake 3 km NNW of Fochville, South Africa with origin time 22:43 UTC on July 31, 2021. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 22:16:32 UTC | 3.0md | 12km WNW of Alder Springs, CA 39.679°, -122.861° | 0.4 km | 1 | - | - | ✓ Reviewed | USGS → |
July 31, 2021 brought a magnitude 3.0 earthquake 12km WNW of Alder Springs, CA, logged at 22:16 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. | ||||||||
2021-07-31 2021-07-31 21:57:07 UTC | 2.3ml | 136 km SE of Perryville, Alaska 54.928°, -157.851° | 43.2 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.3 earthquake 136 km SE of Perryville, Alaska came in on July 31, 2021 at 21:57 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.8 earthquake that occurred about 18 hours earlier. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 21:52:20 UTC | 3.9mb | 220 km WSW of Adak, Alaska 50.997°, -179.471° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2021, worldwide seismic activity registered a magnitude 3.9 earthquake 220 km WSW of Adak, Alaska at 21:52 UTC. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 21:52:08 UTC | 2.3ml | 137 km SE of Perryville, Alaska 54.921°, -157.853° | 38.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place 137 km SE of Perryville, Alaska on July 31, 2021 at 21:52 UTC. Coming 18 hours after a magnitude 2.8 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 21:47:30 UTC | 2.7md | 12km WNW of Alder Springs, CA 39.674°, -122.865° | -0.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 seismic event took place 12km WNW of Alder Springs, CA on July 31, 2021 at 21:47 UTC. This very shallow event was close enough to the surface that even modest magnitudes can produce significant local shaking. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 21:28:07 UTC | 3.0md | 6 km E of La Parguera, Puerto Rico 17.979°, -66.984° | 5.0 km | 1 | - | - | ✓ Reviewed | USGS → |
On July 31, 2021, worldwide seismic activity registered a magnitude 3.0 earthquake 6 km E of La Parguera, Puerto Rico at 21:28 UTC. Coming 6 hours after a magnitude 3.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 21:19:12 UTC | 5.2mww | 17 km W of Bavispe, Mexico 30.453°, -109.120° | 10.0 km | 64 | V | green | ✓ Reviewed | USGS → |
A magnitude 5.2 earthquake was recorded 17 km W of Bavispe, Mexico on July 31, 2021 at 21:19 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. The event was offshore. See the M5.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 21:13:10 UTC | 2.1ml | 64 km SE of Perryville, Alaska 55.484°, -158.453° | 31.9 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 64 km SE of Perryville, Alaska on July 31, 2021 at 21:13 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.7 earthquake that occurred about 16 hours earlier. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 21:12:08 UTC | 2.3ml | 114 km SSE of Perryville, Alaska 54.975°, -158.407° | 37.6 km | - | - | - | ✓ Reviewed | USGS → |
July 31, 2021 brought a magnitude 2.3 earthquake 114 km SSE of Perryville, Alaska, logged at 21:12 UTC. It arrived roughly 18 hours after a larger magnitude 2.7 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 20:50:20 UTC | 2.3ml | 7 km SSE of Coupeville, Washington 48.154°, -122.667° | 28.2 km | 1 | - | - | ✓ Reviewed | USGS → |
On July 31, 2021 at 20:50 UTC, a magnitude 2.3 earthquake struck 7 km SSE of Coupeville, Washington. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 20:35:12 UTC | 2.4ml | 158 km SE of Chignik, Alaska 55.385°, -156.466° | 47.1 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.4 earthquake 158 km SE of Chignik, Alaska came in on July 31, 2021 at 20:35 UTC. It arrived roughly 20 hours after a larger magnitude 2.9 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 20:30:24 UTC | 3.4ml | 54 km NW of Toyah, Texas 31.611°, -104.255° | 6.7 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2021 at 20:30 UTC, a magnitude 3.4 earthquake struck 54 km NW of Toyah, Texas. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 20:21:32 UTC | 2.5ml | 172 km SSW of Akhiok, Alaska 55.635°, -155.660° | 47.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.5 earthquake 172 km SSW of Akhiok, Alaska came in on July 31, 2021 at 20:21 UTC. Coming 19 hours after a magnitude 3.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 20:21:28 UTC | 2.1ml | 22 km WNW of Stanley, Idaho 44.281°, -115.205° | 9.9 km | - | - | - | ✓ Reviewed | USGS → |
July 31, 2021 brought a magnitude 2.1 earthquake 22 km WNW of Stanley, Idaho, logged at 20:21 UTC. Coming 6 hours after a magnitude 2.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 20:06:22 UTC | 2.3md | 4 km WSW of La Parguera, Puerto Rico 17.956°, -67.083° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.3 earthquake 4 km WSW of La Parguera, Puerto Rico at 20:06 UTC on July 31, 2021. Coming 4 hours after a magnitude 3.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 19:57:55 UTC | 4.7mwr | 23 km SSW of Mandráki, Greece 36.410°, 27.063° | 11.0 km | 1 | - | - | ✓ Reviewed | USGS → |
This magnitude 4.7 event was detected 23 km SSW of Mandráki, Greece on July 31, 2021, with origin time 19:57 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 19:36:41 UTC | 2.3ml | 147 km SE of Perryville, Alaska 55.044°, -157.384° | 25.1 km | - | - | - | ✓ Reviewed | USGS → |
On July 31, 2021 at 19:36 UTC, a magnitude 2.3 earthquake struck 147 km SE of Perryville, Alaska. This event falls inside the aftershock decay of a nearby magnitude 3.8 earthquake that occurred about 4 hours earlier. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-31 2021-07-31 19:29:12 UTC | 3.0ml | 167 km SE of Perryville, Alaska 54.878°, -157.230° | 17.2 km | - | - | - | ✓ Reviewed | USGS → |
At 19:29 UTC on July 31, 2021, a magnitude 3.0 tremor occurred 167 km SE of Perryville, Alaska. The event was offshore. See the M3.0 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 July 31, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.