Earthquakes on July 28, 2021
282
EARTHQUAKES on July 28, 2021
24-hour UTC period · USGS data
LARGEST: M5.2 — Kermadec Islands region
356 km deep
Normal activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
2
M4.0–4.9
29
M3.0–3.9
14
M2.0–2.9
53
M1.0–1.9
184
Activity Summary
282
Total earthquakes
~250
Daily average
Normal
Activity level
2
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.2
Kermadec Islands region
21:06 UTC · 356.3 km deep
5.2
Tristan da Cunha region
11:06 UTC · 10.0 km deep
4.8
South Sandwich Islands region
00:27 UTC · 10.0 km deep
4.7
15 km W of Ashil’ta, Russia
00:41 UTC · 10.0 km deep
Felt by 3
4.6
172 km N of Las Khorey, Somalia
19:31 UTC · 10.0 km deep
4.6
61 km W of San Agustín de Valle Fértil, Argentina
18:39 UTC · 80.0 km deep
4.6
122 km NE of Wé, New Caledonia
06:14 UTC · 10.0 km deep
4.6
75 km E of Kirakira, Solomon Islands
04:19 UTC · 10.0 km deep
Earthquake Map — July 28, 2021
All Earthquakes — July 28, 2021
Showing 30 of 98 (filtered from 282)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2021-07-28 2021-07-28 23:51:32 UTC | 2.2md | 26km SSW of Smith Valley, NV 38.569°, -119.462° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.2 earthquake 26km SSW of Smith Valley, NV with origin time 23:51 UTC on July 28, 2021. It arrived roughly 1 hours after a larger magnitude 3.3 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 M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 23:50:23 UTC | 3.3ml | 26km SSW of Smith Valley, NV 38.567°, -119.462° | 1.2 km | 4 | - | - | ✓ Reviewed | USGS → |
This magnitude 3.3 event was detected 26km SSW of Smith Valley, NV on July 28, 2021, with origin time 23:50 UTC. In the 72 hours after this event, the USGS recorded 4 smaller earthquakes within 20 km, consistent with an ongoing aftershock sequence rooted here. See the M3.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 23:50:22 UTC | 2.7ml | 37 km ESE of Malaga, New Mexico 32.070°, -103.713° | 8.7 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2021 at 23:50 UTC, a magnitude 2.7 earthquake struck 37 km ESE of Malaga, New Mexico. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 23:48:53 UTC | 2.3ml | 10km WNW of Imperial, CA 32.888°, -115.664° | 6.6 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2021 at 23:48 UTC, a magnitude 2.3 earthquake struck 10km WNW of Imperial, CA. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 22:06:21 UTC | 2.2md | 28km SE of Markleeville, CA 38.540°, -119.535° | 4.8 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2021, worldwide seismic activity registered a magnitude 2.2 earthquake 28km SE of Markleeville, CA at 22:06 UTC. This event falls inside the aftershock decay of a nearby magnitude 2.7 earthquake that occurred about 6 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. | ||||||||
2021-07-28 2021-07-28 21:41:52 UTC | 2.0ml | 54 km NW of Toyah, Texas 31.605°, -104.255° | 7.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 54 km NW of Toyah, Texas on July 28, 2021 at 21:41 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.3 earthquake that occurred about 6 hours earlier. The event was offshore. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 21:13:48 UTC | 4.5mb | 141 km NW of Ternate, Indonesia 1.696°, 126.481° | 51.7 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.5 seismic event took place 141 km NW of Ternate, Indonesia on July 28, 2021 at 21:13 UTC. The event was offshore. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 21:06:44 UTC | 5.2mb | Kermadec Islands region -30.769°, -179.680° | 356.3 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2021 at 21:06 UTC, a magnitude 5.2 earthquake struck in the Kermadec Islands region. It is the largest earthquake currently listed for worldwide seismic activity on July 28, 2021. See the M5.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 20:52:21 UTC | 2.7ml | 56 km ESE of Nikolski, Alaska 52.705°, -168.125° | 32.5 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.7 earthquake was recorded 56 km ESE of Nikolski, Alaska on July 28, 2021 at 20:52 UTC. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 20:43:15 UTC | 4.4mb | 79 km WSW of San Nicolas, Philippines 14.616°, 119.419° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 4.4 earthquake was recorded 79 km WSW of San Nicolas, Philippines on July 28, 2021 at 20:43 UTC. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 20:38:05 UTC | 2.1ml | 22 km SSE of Moapa Valley, Nevada 36.392°, -114.389° | 3.3 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2021 at 20:38 UTC, a magnitude 2.1 earthquake struck 22 km SSE of Moapa Valley, Nevada. 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. | ||||||||
2021-07-28 2021-07-28 20:36:40 UTC | 4.3mb | 169 km S of Ust’-Kamchatsk Staryy, Russia 54.723°, 162.881° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.3 earthquake 169 km S of Ust’-Kamchatsk Staryy, Russia came in on July 28, 2021 at 20:36 UTC. The event was offshore. See the M4.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 20:30:38 UTC | 2.7ml | 123 km WSW of Adak, Alaska 51.368°, -178.226° | 29.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.7 earthquake 123 km WSW of Adak, Alaska with origin time 20:30 UTC on July 28, 2021. See the M2.7 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 19:57:49 UTC | 2.1md | 6 km ENE of P?hala, Hawaii 19.215°, -155.420° | 34.9 km | - | - | - | Auto | USGS → |
July 28, 2021 brought a magnitude 2.1 earthquake 6 km ENE of P?hala, Hawaii, logged at 19:57 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.3 earthquake that occurred about 7 hours earlier. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 19:38:57 UTC | 2.6md | 30km SE of Markleeville, CA 38.522°, -119.524° | 5.9 km | 1 | - | - | ✓ Reviewed | USGS → |
At 19:38 UTC on July 28, 2021, a magnitude 2.6 tremor occurred 30km SE of Markleeville, CA. It arrived roughly 4 hours after a larger magnitude 2.7 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 19:36:05 UTC | 3.2md | 1 km ENE of Lluveras, Puerto Rico 18.042°, -66.888° | 15.0 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 3.2 earthquake 1 km ENE of Lluveras, Puerto Rico came in on July 28, 2021 at 19:36 UTC. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 19:31:38 UTC | 4.6mb | 172 km N of Las Khorey, Somalia 12.721°, 48.202° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
At 19:31 UTC on July 28, 2021, a magnitude 4.6 tremor occurred 172 km N of Las Khorey, Somalia. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 19:24:03 UTC | 4.4mb | Southern Qinghai, China 34.923°, 91.035° | 10.7 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 4.4 earthquake near Southern Qinghai, China with origin time 19:24 UTC on July 28, 2021. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 19:20:38 UTC | 2.2ml | 37 km ESE of Malaga, New Mexico 32.083°, -103.712° | 7.3 km | - | - | - | ✓ Reviewed | USGS → |
At 19:20 UTC on July 28, 2021, a magnitude 2.2 tremor occurred 37 km ESE of Malaga, New Mexico. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 18:44:20 UTC | 3.1md | 2 km SSW of Guánica, Puerto Rico 17.950°, -66.921° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
July 28, 2021 brought a magnitude 3.1 earthquake 2 km SSW of Guánica, Puerto Rico, logged at 18:44 UTC. See the M3.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 18:43:32 UTC | 2.4ml | 39 km SE of Mina, Nevada 38.178°, -117.749° | 11.3 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2021, worldwide seismic activity registered a magnitude 2.4 earthquake 39 km SE of Mina, Nevada at 18:43 UTC. The event was offshore. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 18:41:43 UTC | 3.5md | 14 km NNW of Brenas, Puerto Rico 18.592°, -66.392° | 109.0 km | 3 | I | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 3.5 earthquake 14 km NNW of Brenas, Puerto Rico with origin time 18:41 UTC on July 28, 2021. See the M3.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 18:39:49 UTC | 4.6mb | 61 km W of San Agustín de Valle Fértil, Argentina -30.575°, -68.102° | 80.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.6 earthquake 61 km W of San Agustín de Valle Fértil, Argentina at 18:39 UTC on July 28, 2021. The event was offshore. See the M4.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 18:19:52 UTC | 4.5mb | 52 km SSE of Hasaki, Japan 35.300°, 141.077° | 37.5 km | - | - | - | ✓ Reviewed | USGS → |
July 28, 2021 brought a magnitude 4.5 earthquake 52 km SSE of Hasaki, Japan, logged at 18:19 UTC. See the M4.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 18:00:34 UTC | 2.9md | 8 km SW of La Parguera, Puerto Rico 17.931°, -67.112° | 9.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.9 earthquake 8 km SW of La Parguera, Puerto Rico at 18:00 UTC on July 28, 2021. It arrived roughly 6 hours after a larger magnitude 3.1 mainshock in the same 20 km area, placing it within the typical aftershock window. The event was offshore. See the M2.9 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 17:40:26 UTC | 4.4mb | 121 km NW of Ternate, Indonesia 1.445°, 126.503° | 53.9 km | - | - | - | ✓ Reviewed | USGS → |
On July 28, 2021, worldwide seismic activity registered a magnitude 4.4 earthquake 121 km NW of Ternate, Indonesia at 17:40 UTC. The event was offshore. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 17:31:13 UTC | 4.0mb | Andreanof Islands, Aleutian Islands, Alaska 51.273°, -177.934° | 38.1 km | - | II | - | ✓ Reviewed | USGS → |
July 28, 2021 brought a magnitude 4.0 earthquake near Andreanof Islands, Aleutian Islands, Alaska, logged at 17:31 UTC. See the M4.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 17:20:11 UTC | 2.4ml | California-Nevada border region 37.381°, -117.172° | 1.8 km | - | - | - | ✓ Reviewed | USGS → |
At 17:20 UTC on July 28, 2021, a magnitude 2.4 tremor occurred in the California-Nevada border region. 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. | ||||||||
2021-07-28 2021-07-28 17:14:19 UTC | 2.3md | 6km SE of Shaver Lake, CA 37.059°, -119.280° | 40.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 earthquake was recorded 6km SE of Shaver Lake, CA on July 28, 2021 at 17:14 UTC. The event was offshore. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2021-07-28 2021-07-28 17:08:02 UTC | 2.1ml | 68 km SE of Port Graham, Alaska 58.954°, -150.922° | 42.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.1 earthquake was recorded 68 km SE of Port Graham, Alaska on July 28, 2021 at 17:08 UTC. The event was offshore. See the M2.1 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 28, 2021. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.