Earthquakes on August 18, 2023
281
EARTHQUAKES on August 18, 2023
24-hour UTC period · USGS data
LARGEST: M5.7 — central Mid-Atlantic Ridge
10 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
40
M3.0–3.9
16
M2.0–2.9
59
M1.0–1.9
162
Activity Summary
281
Total earthquakes
~250
Daily average
Normal
Activity level
4
M5.0+ events
Significant Earthquakes (M4.5+)
5.7
central Mid-Atlantic Ridge
07:57 UTC · 10.0 km deep
5.4
Easter Island region
20:39 UTC · 10.0 km deep
5.4
78 km S of San Juan, Peru
10:27 UTC · 23.2 km deep
Felt by 1
5.0
10 km N of Cumaral, Colombia
01:15 UTC · 10.0 km deep
Felt by 57
4.9
16 km NNW of Biri, Philippines
18:35 UTC · 93.1 km deep
Felt by 1
4.9
20 km W of Hiroo, Japan
18:33 UTC · 61.2 km deep
4.8
30 km NW of Gerāsh, Iran
16:10 UTC · 10.0 km deep
Felt by 2
4.8
90 km NNW of Neiafu, Tonga
13:09 UTC · 64.4 km deep
Earthquake Map — August 18, 2023
All Earthquakes — August 18, 2023
Showing 30 of 119 (filtered from 281)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2023-08-18 2023-08-18 23:36:16 UTC | 4.5mb | central Mid-Atlantic Ridge -0.418°, -19.726° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place near central Mid-Atlantic Ridge on August 18, 2023 at 23:36 UTC. It arrived roughly 16 hours after a larger magnitude 5.7 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 22:37:23 UTC | 2.1ml | 86 km SSW of Nikolski, Alaska 52.231°, -169.393° | 22.4 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.1 earthquake 86 km SSW of Nikolski, Alaska came in on August 18, 2023 at 22:37 UTC. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 21:57:28 UTC | 4.4mb | Kuril Islands 46.770°, 152.853° | 60.6 km | - | - | - | ✓ Reviewed | USGS → |
At 21:57 UTC on August 18, 2023, a magnitude 4.4 tremor occurred near Kuril Islands. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 21:31:27 UTC | 2.1md | 27 km W of Volcano, Hawaii 19.488°, -155.490° | 2.8 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.1 event was detected 27 km W of Volcano, Hawaii on August 18, 2023, with origin time 21:31 UTC. 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. | ||||||||
2023-08-18 2023-08-18 21:29:41 UTC | 2.5ml | 7 km NE of Delta, B.C., MX 32.394°, -115.140° | 7.5 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 7 km NE of Delta, B.C., MX at 21:29 UTC on August 18, 2023. It arrived roughly 11 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 M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 21:28:03 UTC | 2.6ml | 140 km WSW of Nikolski, Alaska 52.580°, -170.851° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.6 event was detected 140 km WSW of Nikolski, Alaska on August 18, 2023, with origin time 21:28 UTC. It arrived roughly 12 hours after a larger magnitude 4.0 mainshock in the same 20 km area, placing it within the typical aftershock window. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 21:21:10 UTC | 2.2ml | 113 km SSW of Sand Point, Alaska 54.346°, -160.926° | 4.8 km | - | - | - | ✓ Reviewed | USGS → |
August 18, 2023 brought a magnitude 2.2 earthquake 113 km SSW of Sand Point, Alaska, logged at 21:21 UTC. 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. | ||||||||
2023-08-18 2023-08-18 20:51:43 UTC | 2.5ml | northern Alaska 67.299°, -145.017° | 8.0 km | - | - | - | ✓ Reviewed | USGS → |
On August 18, 2023, worldwide seismic activity registered a magnitude 2.5 earthquake near northern Alaska at 20:51 UTC. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 20:40:36 UTC | 2.4ml | 22 km SW of Covenant Life, Alaska 59.261°, -136.265° | 3.4 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 seismic event took place 22 km SW of Covenant Life, Alaska on August 18, 2023 at 20:40 UTC. 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. | ||||||||
2023-08-18 2023-08-18 20:40:03 UTC | 2.1ml | 11 km NE of Pāhala, Hawaii 19.259°, -155.392° | 32.2 km | - | - | - | Auto | USGS → |
A magnitude 2.1 seismic event took place 11 km NE of Pāhala, Hawaii on August 18, 2023 at 20:40 UTC. Coming 1 hours after a magnitude 2.2 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. The event was offshore. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 20:39:36 UTC | 2.7ml | 143 km WSW of Nikolski, Alaska 52.295°, -170.698° | 3.5 km | - | - | - | ✓ Reviewed | USGS → |
On August 18, 2023, worldwide seismic activity registered a magnitude 2.7 earthquake 143 km WSW of Nikolski, Alaska at 20:39 UTC. It arrived roughly 10 hours after a larger magnitude 3.1 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 M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 20:39:13 UTC | 5.4mww | Easter Island region -29.605°, -112.403° | 10.0 km | - | - | green | ✓ Reviewed | USGS → |
A magnitude 5.4 earthquake was recorded in the Easter Island region on August 18, 2023 at 20:39 UTC. The USGS PAGER system assigned a green alert level for this event, signalling no significant casualties or damage expected. See the M5.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 20:36:36 UTC | 3.0ml | 20 km S of Trona, CA 35.584°, -117.381° | 4.0 km | 2 | - | - | ✓ Reviewed | USGS → |
August 18, 2023 brought a magnitude 3.0 earthquake 20 km S of Trona, CA, logged at 20:36 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. | ||||||||
2023-08-18 2023-08-18 20:36:15 UTC | 4.5mb | 188 km NNW of Sola, Vanuatu -12.227°, 167.104° | 285.6 km | - | - | - | ✓ Reviewed | USGS → |
August 18, 2023 brought a magnitude 4.5 earthquake 188 km NNW of Sola, Vanuatu, logged at 20:36 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 20:09:49 UTC | 4.3mb | 297 km WSW of Tual, Indonesia -6.299°, 130.150° | 141.9 km | - | - | - | ✓ Reviewed | USGS → |
On August 18, 2023, worldwide seismic activity registered a magnitude 4.3 earthquake 297 km WSW of Tual, Indonesia at 20:09 UTC. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 20:05:27 UTC | 2.0ml | 19 km ESE of Kasilof, Alaska 60.252°, -150.975° | 60.4 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 19 km ESE of Kasilof, Alaska with origin time 20:05 UTC on August 18, 2023. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 20:03:19 UTC | 3.1ml | 110 km WSW of Adak, Alaska 51.407°, -178.042° | 63.5 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 3.1 event was detected 110 km WSW of Adak, Alaska on August 18, 2023, with origin time 20:03 UTC. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 19:39:57 UTC | 2.2ml | 14 km ESE of Pāhala, Hawaii 19.170°, -155.344° | 25.8 km | - | - | - | Auto | USGS → |
On August 18, 2023, worldwide seismic activity registered a magnitude 2.2 earthquake 14 km ESE of Pāhala, Hawaii at 19:39 UTC. It arrived roughly 14 hours after a larger magnitude 2.7 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. | ||||||||
2023-08-18 2023-08-18 19:39:49 UTC | 2.2ml | 7 km ESE of Pāhala, Hawaii 19.167°, -155.418° | 43.3 km | - | - | - | Auto | USGS → |
A magnitude 2.2 seismic event took place 7 km ESE of Pāhala, Hawaii on August 18, 2023 at 19:39 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.7 earthquake that occurred about 14 hours earlier. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 19:24:24 UTC | 2.7ml | 142 km WSW of Nikolski, Alaska 52.585°, -170.888° | 10.7 km | - | - | - | ✓ Reviewed | USGS → |
At 19:24 UTC on August 18, 2023, a magnitude 2.7 tremor occurred 142 km WSW of Nikolski, Alaska. This event falls inside the aftershock decay of a nearby magnitude 4.0 earthquake that occurred about 10 hours earlier. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 18:45:48 UTC | 2.1ml | 16 km E of Hawthorne, Nevada 38.551°, -118.441° | 2.3 km | - | - | - | ✓ Reviewed | USGS → |
August 18, 2023 brought a magnitude 2.1 earthquake 16 km E of Hawthorne, Nevada, logged at 18:45 UTC. It arrived roughly 5 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. | ||||||||
2023-08-18 2023-08-18 18:35:15 UTC | 4.9mb | 16 km NNW of Biri, Philippines 12.817°, 124.306° | 93.1 km | 1 | - | - | ✓ Reviewed | USGS → |
At 18:35 UTC on August 18, 2023, a magnitude 4.9 tremor occurred 16 km NNW of Biri, Philippines. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 18:33:04 UTC | 4.9mww | 20 km W of Hiroo, Japan 42.316°, 143.049° | 61.2 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.9 earthquake 20 km W of Hiroo, Japan at 18:33 UTC on August 18, 2023. The event was offshore. See the M4.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 18:29:15 UTC | 4.4mb | 118 km S of Jatiroto, Indonesia -8.958°, 111.082° | 16.3 km | 1 | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 118 km S of Jatiroto, Indonesia at 18:29 UTC on August 18, 2023. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 18:26:10 UTC | 3.2ml | 43 km ENE of Nelson Lagoon, Alaska 56.080°, -160.524° | 152.2 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.2 earthquake 43 km ENE of Nelson Lagoon, Alaska with origin time 18:26 UTC on August 18, 2023. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 18:22:25 UTC | 4.4mb | 12 km NNW of Miyako, Japan 39.746°, 141.884° | 58.3 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.4 event was detected 12 km NNW of Miyako, Japan on August 18, 2023, with origin time 18:22 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 18:20:17 UTC | 2.7ml | 11 km NE of Stanley, Idaho 44.290°, -114.830° | 13.1 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.7 earthquake 11 km NE of Stanley, Idaho at 18:20 UTC on August 18, 2023. The event was offshore. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 18:04:51 UTC | 2.2md | 2 km WSW of Indios, Puerto Rico 17.985°, -66.846° | 17.3 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 2 km WSW of Indios, Puerto Rico at 18:04 UTC on August 18, 2023. Coming 16 hours after a magnitude 2.5 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. | ||||||||
2023-08-18 2023-08-18 17:49:38 UTC | 4.3mb | 50 km NE of Lobuche, Nepal 28.289°, 87.151° | 79.5 km | - | - | - | ✓ Reviewed | USGS → |
At 17:49 UTC on August 18, 2023, a magnitude 4.3 tremor occurred 50 km NE of Lobuche, Nepal. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2023-08-18 2023-08-18 17:48:43 UTC | 4.0mb | 25 km SSE of Camiña, Chile -19.523°, -69.319° | 108.6 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.0 earthquake 25 km SSE of Camiña, Chile with origin time 17:48 UTC on August 18, 2023. See the M4.0 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 August 18, 2023. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.