Earthquakes on April 17, 2021
359
EARTHQUAKES on April 17, 2021
24-hour UTC period · USGS data
LARGEST: M5.1 — Mariana Islands region
10 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
36
M3.0–3.9
15
M2.0–2.9
72
M1.0–1.9
232
Activity Summary
359
Total earthquakes
~250
Daily average
Elevated
Activity level
4
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.1
Mariana Islands region
01:27 UTC · 10.0 km deep
5.0
22 km S of Mandráki, Greece
17:08 UTC · 10.0 km deep
Felt by 3
5.0
near the east coast of the Kamchatka Peninsula, Russia
15:45 UTC · 83.2 km deep
Felt by 1
5.0
46 km SSE of Banda Aceh, Indonesia
01:04 UTC · 99.2 km deep
Felt by 1
4.9
85 km W of Ovalle, Chile
03:50 UTC · 10.0 km deep
Felt by 11
4.8
85 km NE of Hihifo, Tonga
20:57 UTC · 10.0 km deep
4.8
138 km NW of Panguna, Papua New Guinea
13:24 UTC · 178.4 km deep
4.7
16 km SSE of Quilca, Peru
23:45 UTC · 44.6 km deep
Felt by 5
Earthquake Map — April 17, 2021
All Earthquakes — April 17, 2021
Showing 30 of 127 (filtered from 359)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-04-17 2021-04-17 23:45:29 UTC | 4.7mwr | 16 km SSE of Quilca, Peru -16.846°, -72.370° | 44.6 km | 5 | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.7 earthquake 16 km SSE of Quilca, Peru came in on April 17, 2021 at 23:45 UTC. See the M4.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:42:57 UTC | 2.6md | 3 km SSW of Indios, Puerto Rico 17.968°, -66.833° | 16.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.6 earthquake 3 km SSW of Indios, Puerto Rico came in on April 17, 2021 at 23:42 UTC. Coming 2 hours after a magnitude 2.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:39:35 UTC | 2.8ml | 190 km E of Atka, Alaska 52.049°, -171.430° | 35.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.8 earthquake 190 km E of Atka, Alaska came in on April 17, 2021 at 23:39 UTC. The event was offshore. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:37:02 UTC | 2.3ml | 224 km WSW of Adak, Alaska 50.948°, -179.497° | 68.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 224 km WSW of Adak, Alaska on April 17, 2021 at 23:37 UTC. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:35:15 UTC | 2.2ml | 39 km W of Mentone, Texas 31.712°, -104.016° | 7.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 39 km W of Mentone, Texas with origin time 23:35 UTC on April 17, 2021. The event was offshore. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:28:11 UTC | 4.4mb | 143 km WSW of Abepura, Indonesia -2.853°, 139.364° | 65.6 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected 143 km WSW of Abepura, Indonesia on April 17, 2021, with origin time 23:28 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:26:00 UTC | 2.7ml | 99 km SE of False Pass, Alaska 54.167°, -162.433° | 20.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 99 km SE of False Pass, Alaska at 23:26 UTC on April 17, 2021. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:20:28 UTC | 4.1mb | 81 km NNE of Calama, Chile -21.747°, -68.708° | 117.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.1 earthquake was recorded 81 km NNE of Calama, Chile on April 17, 2021 at 23:20 UTC. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:15:38 UTC | 4.4mb | 230 km ESE of Yigo Village, Guam 12.498°, 146.734° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.4 earthquake 230 km ESE of Yigo Village, Guam came in on April 17, 2021 at 23:15 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:06:25 UTC | 2.8ml | 79 km WNW of Akhiok, Alaska 57.096°, -155.454° | 53.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 seismic event took place 79 km WNW of Akhiok, Alaska on April 17, 2021 at 23:06 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 23:02:54 UTC | 4.5mb | 150 km SE of Kandrian, Papua New Guinea -7.066°, 150.607° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021 at 23:02 UTC, a magnitude 4.5 earthquake struck 150 km SE of Kandrian, Papua New Guinea. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 22:51:22 UTC | 2.5ml | 46 km WSW of Aleneva, Alaska 57.948°, -153.675° | 50.3 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021 at 22:51 UTC, a magnitude 2.5 earthquake struck 46 km WSW of Aleneva, Alaska. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 22:35:55 UTC | 4.4mb | 29 km S of Mandráki, Greece 36.346°, 27.112° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 seismic event took place 29 km S of Mandráki, Greece on April 17, 2021 at 22:35 UTC. It arrived roughly 5 hours after a larger magnitude 5.0 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. | ||||||||
2021-04-17 2021-04-17 22:31:04 UTC | 4.1mb | 109 km W of Palaióchora, Greece 35.245°, 22.482° | 30.9 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.1 earthquake 109 km W of Palaióchora, Greece with origin time 22:31 UTC on April 17, 2021. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 22:23:49 UTC | 2.7ml | 221 km SW of Nikolski, Alaska 51.361°, -170.839° | 22.1 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.7 event was detected 221 km SW of Nikolski, Alaska on April 17, 2021, with origin time 22:23 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 22:07:21 UTC | 2.8ml | 101 km NNW of Arctic Village, Alaska 68.977°, -146.428° | 9.4 km | - | - | - | ✓ Reviewed | USGS → |
April 17, 2021 brought a magnitude 2.8 earthquake 101 km NNW of Arctic Village, Alaska, logged at 22:07 UTC. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 21:45:44 UTC | 3.8ml | 98 km SSE of Adak, Alaska 51.090°, -175.965° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021 at 21:45 UTC, a magnitude 3.8 earthquake struck 98 km SSE of Adak, Alaska. See the M3.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 21:40:12 UTC | 2.3ml | 76 km WSW of Inuvik, Canada 68.138°, -135.489° | 24.5 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.3 earthquake 76 km WSW of Inuvik, Canada with origin time 21:40 UTC on April 17, 2021. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 21:22:21 UTC | 2.7md | 4 km S of Indios, Puerto Rico 17.953°, -66.823° | 9.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021, worldwide seismic activity registered a magnitude 2.7 earthquake 4 km S of Indios, Puerto Rico at 21:22 UTC. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 21:04:15 UTC | 2.2ml | 57 km S of Whites City, New Mexico 31.657°, -104.297° | 6.1 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 57 km S of Whites City, New Mexico at 21:04 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.1 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. | ||||||||
2021-04-17 2021-04-17 20:59:23 UTC | 3.1ml | 57 km S of Whites City, New Mexico 31.663°, -104.297° | 7.3 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021, worldwide seismic activity registered a magnitude 3.1 earthquake 57 km S of Whites City, New Mexico at 20:59 UTC. The event was offshore. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:57:12 UTC | 4.1mb | 31 km S of Mandráki, Greece 36.332°, 27.067° | 9.4 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021, worldwide seismic activity registered a magnitude 4.1 earthquake 31 km S of Mandráki, Greece at 20:57 UTC. It arrived roughly 4 hours after a larger magnitude 5.0 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:57:10 UTC | 4.8mb | 85 km NE of Hihifo, Tonga -15.445°, -173.192° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.8 earthquake 85 km NE of Hihifo, Tonga at 20:57 UTC on April 17, 2021. The event was offshore. See the M4.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:56:48 UTC | 2.0md | 10 km ENE of P?hala, Hawaii 19.240°, -155.391° | 29.8 km | - | - | - | Auto | USGS → |
A magnitude 2.0 seismic event took place 10 km ENE of P?hala, Hawaii on April 17, 2021 at 20:56 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.2 earthquake that occurred about 10 hours earlier. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:48:45 UTC | 2.2ml | 48 km SSW of Shungnak, Alaska 66.469°, -157.415° | 6.8 km | - | - | - | ✓ Reviewed | USGS → |
At 20:48 UTC on April 17, 2021, a magnitude 2.2 tremor occurred 48 km SSW of Shungnak, Alaska. In the 72 hours after this event, the USGS recorded 3 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:46:09 UTC | 4.1mb | 16 km NNW of P’ot’i, Georgia 42.285°, 41.628° | 11.3 km | 1 | - | - | ✓ Reviewed | USGS → |
At 20:46 UTC on April 17, 2021, a magnitude 4.1 tremor occurred 16 km NNW of P’ot’i, Georgia. See the M4.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:46:08 UTC | 2.2ml | 7 km ENE of Honaunau-Napoopoo, Hawaii 19.476°, -155.799° | 8.0 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021 at 20:46 UTC, a magnitude 2.2 earthquake struck 7 km ENE of Honaunau-Napoopoo, Hawaii. Coming 15 hours after a magnitude 3.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:45:23 UTC | 4.3mb | 7 km ENE of Narut?, Japan 35.630°, 140.488° | 53.3 km | - | - | - | ✓ Reviewed | USGS → |
On April 17, 2021, worldwide seismic activity registered a magnitude 4.3 earthquake 7 km ENE of Narut?, Japan at 20:45 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:39:08 UTC | 2.3md | 38km NNE of Covelo, CA 40.101°, -123.044° | 39.6 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.3 earthquake 38km NNE of Covelo, CA came in on April 17, 2021 at 20:39 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.9 earthquake that occurred about 1 hours earlier. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-04-17 2021-04-17 20:31:37 UTC | 2.4ml | 89 km SSE of Sand Point, Alaska 54.627°, -159.844° | 25.5 km | - | - | - | ✓ Reviewed | USGS → |
At 20:31 UTC on April 17, 2021, a magnitude 2.4 tremor occurred 89 km SSE of Sand Point, Alaska. It arrived roughly 11 hours after a larger magnitude 2.7 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.4 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 April 17, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.