Earthquakes on September 27, 2021
318
EARTHQUAKES on September 27, 2021
24-hour UTC period · USGS data
LARGEST: M6.0 — 6 km N of Thrapsanón, Greece
6 km deep · 135 people felt it
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
40
M3.0–3.9
15
M2.0–2.9
66
M1.0–1.9
195
Activity Summary
318
Total earthquakes
~250
Daily average
Elevated
Activity level
2
M5.0+ events
Significant Earthquakes (M4.5+)
6.0
6 km N of Thrapsanón, Greece
06:17 UTC · 6.0 km deep
Felt by 135
5.1
66 km WSW of Murghob, Tajikistan
05:40 UTC · 10.0 km deep
Felt by 2
4.8
6 km NE of Pýrgos, Greece
11:02 UTC · 10.0 km deep
Felt by 6
4.7
5 km W of Thrapsanón, Greece
20:10 UTC · 10.0 km deep
Felt by 2
4.7
6 km S of Arkalochóri, Greece
06:37 UTC · 7.7 km deep
Felt by 8
4.6
86 km N of Cruzeiro do Sul, Brazil
21:52 UTC · 10.0 km deep
Felt by 2
4.6
156 km NW of Nuku‘alofa, Tonga
14:06 UTC · 10.0 km deep
4.6
38 km ESE of Kitaibaraki, Japan
11:26 UTC · 50.4 km deep
Felt by 15
Earthquake Map — September 27, 2021
All Earthquakes — September 27, 2021
Showing 30 of 123 (filtered from 318)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-09-27 2021-09-27 23:56:43 UTC | 2.3ml | 21 km E of Sand Point, Alaska 55.336°, -160.154° | 66.5 km | - | - | - | ✓ Reviewed | USGS → |
September 27, 2021 brought a magnitude 2.3 earthquake 21 km E of Sand Point, Alaska, logged at 23:56 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 23:19:01 UTC | 3.0md | 7 km WSW of La Parguera, Puerto Rico 17.951°, -67.111° | 8.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.0 earthquake 7 km WSW of La Parguera, Puerto Rico came in on September 27, 2021 at 23:19 UTC. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 23:06:11 UTC | 4.3mb | 241 km E of Levuka, Fiji -18.012°, -178.402° | 589.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.3 earthquake 241 km E of Levuka, Fiji with origin time 23:06 UTC on September 27, 2021. 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. | ||||||||
2021-09-27 2021-09-27 22:56:57 UTC | 2.3ml | 14 km NW of Stanley, Idaho 44.325°, -115.050° | 12.9 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2021 at 22:56 UTC, a magnitude 2.3 earthquake struck 14 km NW of Stanley, Idaho. Coming 20 hours after a magnitude 2.4 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. | ||||||||
2021-09-27 2021-09-27 22:53:14 UTC | 2.9ml | 28 km SSW of Skwentna, Alaska 61.767°, -151.665° | 91.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.9 seismic event took place 28 km SSW of Skwentna, Alaska on September 27, 2021 at 22:53 UTC. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 22:35:19 UTC | 4.3mb | 41 km NE of Tobelo, Indonesia 1.982°, 128.283° | 111.0 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2021, worldwide seismic activity registered a magnitude 4.3 earthquake 41 km NE of Tobelo, Indonesia at 22:35 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 22:30:27 UTC | 3.4ml | 73 km SW of Kaktovik, Alaska 69.588°, -144.717° | 20.9 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.4 event was detected 73 km SW of Kaktovik, Alaska on September 27, 2021, with origin time 22:30 UTC. The event was offshore. See the M3.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 22:27:55 UTC | 2.7md | 13km SE of Petrolia, CA 40.258°, -124.164° | 12.3 km | - | - | - | ✓ Reviewed | USGS → |
At 22:27 UTC on September 27, 2021, a magnitude 2.7 tremor occurred 13km SE of Petrolia, CA. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 22:25:41 UTC | 2.1ml | 79 km W of Akhiok, Alaska 56.903°, -155.477° | 68.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.1 earthquake 79 km W of Akhiok, Alaska with origin time 22:25 UTC on September 27, 2021. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 22:21:57 UTC | 3.3md | South Carolina 32.944°, -80.154° | 6.8 km | 2,806 | IV | - | ✓ Reviewed | USGS → |
A magnitude 3.3 seismic event took place near South Carolina on September 27, 2021 at 22:21 UTC. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 22:16:17 UTC | 2.4md | 3 km S of P?hala, Hawaii 19.169°, -155.478° | 35.2 km | - | - | - | Auto | USGS → |
On September 27, 2021, worldwide seismic activity registered a magnitude 2.4 earthquake 3 km S of P?hala, Hawaii at 22:16 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.8 earthquake that occurred about 9 hours earlier. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 22:03:21 UTC | 3.9mb | 177 km SSW of Adak, Alaska 50.525°, -177.980° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.9 earthquake 177 km SSW of Adak, Alaska with origin time 22:03 UTC on September 27, 2021. See the M3.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 21:59:13 UTC | 2.1ml | 6 km SSW of Volcano, Hawaii 19.382°, -155.248° | 1.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 seismic event took place 6 km SSW of Volcano, Hawaii on September 27, 2021 at 21:59 UTC. It arrived roughly 4 hours after a larger magnitude 2.6 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 M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 21:52:32 UTC | 4.6mb | 86 km N of Cruzeiro do Sul, Brazil -6.850°, -72.704° | 10.0 km | 2 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.6 earthquake 86 km N of Cruzeiro do Sul, Brazil at 21:52 UTC on September 27, 2021. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 21:47:44 UTC | 2.1md | 2 km NNE of P?hala, Hawaii 19.223°, -155.468° | 32.0 km | - | - | - | Auto | USGS → |
On September 27, 2021 at 21:47 UTC, a magnitude 2.1 earthquake struck 2 km NNE of P?hala, Hawaii. Coming 8 hours after a magnitude 3.8 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. | ||||||||
2021-09-27 2021-09-27 21:39:10 UTC | 2.1md | 2 km S of P?hala, Hawaii 19.182°, -155.474° | 40.3 km | - | - | - | Auto | USGS → |
A magnitude 2.1 earthquake was recorded 2 km S of P?hala, Hawaii on September 27, 2021 at 21:39 UTC. It arrived roughly 8 hours after a larger magnitude 3.8 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. | ||||||||
2021-09-27 2021-09-27 21:37:11 UTC | 4.3mwr | 3 km NW of Kastélli, Greece 35.231°, 25.318° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 21:37 UTC on September 27, 2021, a magnitude 4.3 tremor occurred 3 km NW of Kastélli, Greece. It arrived roughly 15 hours after a larger magnitude 6.0 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 20:32:57 UTC | 2.4ml | 5 km SW of Volcano, Hawaii 19.414°, -155.278° | 0.9 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.4 event was detected 5 km SW of Volcano, Hawaii on September 27, 2021, with origin time 20:32 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.6 earthquake that occurred about 2 hours earlier. 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. | ||||||||
2021-09-27 2021-09-27 20:29:59 UTC | 2.2ml | 47 km SW of Karluk, Alaska 57.265°, -155.003° | 45.3 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2021 at 20:29 UTC, a magnitude 2.2 earthquake struck 47 km SW of Karluk, Alaska. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 20:21:27 UTC | 3.0ml | 85 km SSW of Unalaska, Alaska 53.124°, -166.834° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
At 20:21 UTC on September 27, 2021, a magnitude 3.0 tremor occurred 85 km SSW of Unalaska, Alaska. See the M3.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 20:10:01 UTC | 4.7mb | 5 km W of Thrapsanón, Greece 35.195°, 25.225° | 10.0 km | 2 | - | - | ✓ Reviewed | USGS → |
On September 27, 2021, worldwide seismic activity registered a magnitude 4.7 earthquake 5 km W of Thrapsanón, Greece at 20:10 UTC. It arrived roughly 14 hours after a larger magnitude 6.0 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 19:18:00 UTC | 4.2mb | Vanuatu region -14.137°, 170.535° | 634.5 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2021, worldwide seismic activity registered a magnitude 4.2 earthquake in the Vanuatu region at 19:18 UTC. This is the deepest earthquake in the current dataset — a deep-focus event. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 18:55:49 UTC | 2.3ml | 27 km NW of Stanley, Idaho 44.365°, -115.210° | 0.9 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.3 event was detected 27 km NW of Stanley, Idaho on September 27, 2021, with origin time 18:55 UTC. Coming 16 hours after a magnitude 2.4 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 M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 18:36:51 UTC | 2.2md | 28km SE of Markleeville, CA 38.545°, -119.532° | 4.8 km | - | - | - | ✓ Reviewed | USGS → |
September 27, 2021 brought a magnitude 2.2 earthquake 28km SE of Markleeville, CA, logged at 18:36 UTC. Coming 3 hours after a magnitude 2.9 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 18:19:29 UTC | 2.0md | 12 km SSE of Guánica, Puerto Rico 17.861°, -66.879° | 16.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 12 km SSE of Guánica, Puerto Rico at 18:19 UTC on September 27, 2021. This event falls inside the aftershock decay of a nearby magnitude 3.2 earthquake that occurred about 14 hours earlier. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 18:18:10 UTC | 2.6ml | 6 km SW of Volcano, Hawaii 19.406°, -155.284° | 1.1 km | - | - | - | ✓ Reviewed | USGS → |
September 27, 2021 brought a magnitude 2.6 earthquake 6 km SW of Volcano, Hawaii, logged at 18:18 UTC. In the 72 hours after this event, the USGS recorded 6 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 17:56:31 UTC | 4.5mb | 83 km W of San Antonio de los Cobres, Argentina -24.216°, -67.139° | 176.3 km | - | - | - | ✓ Reviewed | USGS → |
On September 27, 2021 at 17:56 UTC, a magnitude 4.5 earthquake struck 83 km W of San Antonio de los Cobres, Argentina. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 17:34:07 UTC | 2.2ml | 55 km S of Whites City, New Mexico 31.678°, -104.385° | 6.8 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.2 earthquake was recorded 55 km S of Whites City, New Mexico on September 27, 2021 at 17:34 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.8 earthquake that occurred about 1 hours earlier. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 17:21:15 UTC | 4.3mb | Pagan region, Northern Mariana Islands 18.162°, 145.772° | 155.7 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.3 earthquake in the Pagan region, Northern Mariana Islands at 17:21 UTC on September 27, 2021. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-09-27 2021-09-27 17:20:40 UTC | 4.4mb | 68 km ESE of San Felipe, Mexico 30.865°, -114.151° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 68 km ESE of San Felipe, Mexico at 17:20 UTC on September 27, 2021. See the M4.4 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 September 27, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.