Earthquakes on December 10, 2025
500
EARTHQUAKES on December 10, 2025
24-hour UTC period · USGS data
33 km deep
Elevated activitycompared to daily average (~250/day)
Magnitude Breakdown
M5.0+
4
M4.0–4.9
29
M3.0–3.9
22
M2.0–2.9
276
M1.0–1.9
169
Activity Summary
500
Total earthquakes
~250
Daily average
Elevated
Activity level
4
M5.0+ events
Geographic Breakdown
By US State
Top Countries (International)
Significant Earthquakes (M4.5+)
5.7
108 km ENE of Hachinohe, Japan
14:52 UTC · 33.0 km deep
5.5
5 km WNW of Cepitá, Colombia
08:27 UTC · 164.1 km deep
Felt by 110
5.2
67 km WSW of Vallenar, Chile
06:38 UTC · 44.7 km deep
Felt by 1
5.1
66 km W of Panguna, Papua New Guinea
13:30 UTC · 87.8 km deep
4.9
106 km WSW of Banda Aceh, Indonesia
07:42 UTC · 42.6 km deep
4.8
Volcano Islands, Japan region
05:18 UTC · 42.4 km deep
4.7
121 km N of Yakutat, Alaska
11:28 UTC · 5.9 km deep
Felt by 2
4.7
142 km E of Yamada, Japan
10:55 UTC · 10.0 km deep
Earthquake Map — December 10, 2025

All Earthquakes — December 10, 2025
Showing 30 of 331 (filtered from 500)
(Filtered to M2.0+. Change the magnitude filter to see smaller events.)
| Time ↓ | Mag ↕ | Location ↕ | Depth ↕ | Felt ↕ | MMI | Alert | Status | Details |
|---|---|---|---|---|---|---|---|---|
2025-12-10 2025-12-10 23:59:32 UTC | 2.5ml | 39 km ENE of Pedro Bay, Alaska 59.914°, -153.439° | 145.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.5 earthquake was recorded 39 km ENE of Pedro Bay, Alaska on December 10, 2025 at 23:59 UTC. At a depth of 145.6 km, the event was intermediate depth. The epicenter is at 59.914°, -153.439°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:52:43 UTC | 2.4ml | 53 km N of Petersville, Alaska 62.977°, -150.788° | 99.1 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.4 earthquake was recorded 53 km N of Petersville, Alaska on December 10, 2025 at 23:52 UTC. At a depth of 99.1 km, the event was intermediate depth. The offshore location combined with this depth is characteristic of seismicity along descending slabs. Coordinates: 62.977°, -150.788°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:50:15 UTC | 2.6ml | 93 km N of Yakutat, Alaska 60.374°, -139.462° | 2.8 km | - | - | - | ✓ Reviewed | USGS → |
December 10, 2025 brought a magnitude 2.6 earthquake 93 km N of Yakutat, Alaska, logged at 23:50 UTC. It arrived roughly 8 hours after a larger magnitude 3.3 mainshock in the same 20 km area, placing it within the typical aftershock window. At a depth of just 2.8 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at 60.374°, -139.462°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:50:10 UTC | 2.5ml | 106 km N of Yakutat, Alaska 60.496°, -139.578° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.5 earthquake 106 km N of Yakutat, Alaska with origin time 23:50 UTC on December 10, 2025. This event falls inside the aftershock decay of a nearby magnitude 3.7 earthquake that occurred about 14 hours earlier. The event originated approximately 5.0 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 60.496°N, -139.578°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:47:27 UTC | 2.5ml | 94 km WSW of Adak, Alaska 51.431°, -177.803° | 32.1 km | - | - | - | ✓ Reviewed | USGS → |
On December 10, 2025, worldwide seismic activity registered a magnitude 2.5 earthquake 94 km WSW of Adak, Alaska at 23:47 UTC. This was a shallow crustal earthquake, focused at 32.1 km depth. Coordinates: 51.431°, -177.803°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:44:29 UTC | 2.0ml | 99 km N of Yakutat, Alaska 60.432°, -139.539° | 2.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.0 earthquake 99 km N of Yakutat, Alaska with origin time 23:44 UTC on December 10, 2025. It arrived roughly 8 hours after a larger magnitude 3.3 mainshock in the same 20 km area, placing it within the typical aftershock window. At a depth of just 2.1 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at 60.432°, -139.539°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:42:05 UTC | 2.0ml | 113 km N of Yakutat, Alaska 60.560°, -139.849° | 5.9 km | - | - | - | ✓ Reviewed | USGS → |
On December 10, 2025, worldwide seismic activity registered a magnitude 2.0 earthquake 113 km N of Yakutat, Alaska at 23:42 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.7 earthquake that occurred about 12 hours earlier. At a depth of 5.9 km, the event was shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 60.560°N, -139.849°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:35:58 UTC | 3.2ml | 85 km WSW of Atka, Alaska 51.809°, -175.268° | 66.7 km | - | - | - | ✓ Reviewed | USGS → |
December 10, 2025 brought a magnitude 3.2 earthquake 85 km WSW of Atka, Alaska, logged at 23:35 UTC. This was a shallow crustal earthquake, focused at 66.7 km depth. The epicenter is at 51.809°, -175.268°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:33:47 UTC | 2.2ml | 101 km N of Yakutat, Alaska 60.448°, -139.476° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 10, 2025, worldwide seismic activity registered a magnitude 2.2 earthquake 101 km N of Yakutat, Alaska at 23:33 UTC. Coming 8 hours after a magnitude 3.3 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. This was a shallow crustal earthquake, focused at 5.0 km depth. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: 60.448°, -139.476°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:26:33 UTC | 2.1ml | 104 km N of Yakutat, Alaska 60.484°, -139.608° | 2.5 km | - | - | - | ✓ Reviewed | USGS → |
At 23:26 UTC on December 10, 2025, a magnitude 2.1 tremor occurred 104 km N of Yakutat, Alaska. This event falls inside the aftershock decay of a nearby magnitude 3.7 earthquake that occurred about 14 hours earlier. At a depth of just 2.5 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 60.484°N, -139.608°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:15:07 UTC | 4.4mb | 210 km SSE of Alo, Wallis and Futuna -16.017°, -177.241° | 429.6 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 4.4 earthquake 210 km SSE of Alo, Wallis and Futuna at 23:15 UTC on December 10, 2025. At 429.6 km, this deep-focus earthquake originated far below the brittle crust, deep inside the mantle. The epicenter is at -16.017°, -177.241°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.4 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:08:40 UTC | 4.2mb | 159 km SE of Kirakira, Solomon Islands -11.342°, 163.071° | 10.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 4.2 event was detected 159 km SE of Kirakira, Solomon Islands on December 10, 2025, with origin time 23:08 UTC. The event originated approximately 10.0 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: -11.342°, 163.071°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 23:05:24 UTC | 2.2ml | 54 km SE of Adak, Alaska 51.523°, -176.082° | 41.2 km | - | - | - | ✓ Reviewed | USGS → |
At 23:05 UTC on December 10, 2025, a magnitude 2.2 tremor occurred 54 km SE of Adak, Alaska. It arrived roughly 13 hours after a larger magnitude 2.3 mainshock in the same 20 km area, placing it within the typical aftershock window. The hypocenter lay at 41.2 km, placing this in the shallow crustal category. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at 51.523°, -176.082°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:59:41 UTC | 2.2ml | 120 km N of Yakutat, Alaska 60.621°, -139.999° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.2 earthquake 120 km N of Yakutat, Alaska at 22:59 UTC on December 10, 2025. This event falls inside the aftershock decay of a nearby magnitude 4.7 earthquake that occurred about 12 hours earlier. At a depth of 5.0 km, the event was shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 60.621°N, -139.999°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:58:17 UTC | 2.3ml | 102 km N of Yakutat, Alaska 60.455°, -139.465° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.3 seismic event took place 102 km N of Yakutat, Alaska on December 10, 2025 at 22:58 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.3 earthquake that occurred about 8 hours earlier. The event originated approximately 5.0 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 60.455°N, -139.465°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.3 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:52:23 UTC | 2.0ml | 76 km WNW of Ninilchik, Alaska 60.326°, -152.924° | 127.4 km | - | - | - | ✓ Reviewed | USGS → |
At 22:52 UTC on December 10, 2025, a magnitude 2.0 tremor occurred 76 km WNW of Ninilchik, Alaska. The event originated approximately 127.4 km below the surface, classifying it as intermediate depth. Coordinates: 60.326°, -152.924°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:50:41 UTC | 2.5ml | 116 km N of Yakutat, Alaska 60.588°, -139.977° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
At 22:50 UTC on December 10, 2025, a magnitude 2.5 tremor occurred 116 km N of Yakutat, Alaska. It arrived roughly 11 hours after a larger magnitude 4.7 mainshock in the same 20 km area, placing it within the typical aftershock window. The hypocenter lay at 5.0 km, placing this in the shallow crustal category. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at 60.588°, -139.977°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:49:21 UTC | 2.5ml | 119 km N of Yakutat, Alaska 60.615°, -139.971° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.5 earthquake 119 km N of Yakutat, Alaska at 22:49 UTC on December 10, 2025. This event falls inside the aftershock decay of a nearby magnitude 4.7 earthquake that occurred about 11 hours earlier. At a depth of 5.0 km, the event was shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 60.615°N, -139.971°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.5 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:44:32 UTC | 2.0md | 4 km ESE of San Ramon, CA 37.759°, -121.937° | 7.6 km | 9 | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 earthquake was recorded 4 km ESE of San Ramon, CA on December 10, 2025 at 22:44 UTC. A small number of nearby observers (9) submitted felt reports to the USGS. This was a shallow crustal earthquake, focused at 7.6 km depth. Coordinates: 37.759°, -121.937°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:37:18 UTC | 2.0ml | 55 km NNE of Chenega, Alaska 60.510°, -147.550° | 3.8 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.0 earthquake 55 km NNE of Chenega, Alaska at 22:37 UTC on December 10, 2025. At a depth of just 3.8 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. The epicenter is at 60.510°, -147.550°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:28:30 UTC | 2.0ml | 105 km N of Yakutat, Alaska 60.495°, -139.591° | 5.0 km | - | - | - | ✓ Reviewed | USGS → |
This magnitude 2.0 event was detected 105 km N of Yakutat, Alaska on December 10, 2025, with origin time 22:28 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.7 earthquake that occurred about 13 hours earlier. The hypocenter lay at 5.0 km, placing this in the shallow crustal category. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 60.495°N, -139.591°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:26:53 UTC | 2.0ml | 107 km N of Yakutat, Alaska 60.512°, -139.630° | 3.3 km | - | - | - | ✓ Reviewed | USGS → |
Reports of a magnitude 2.0 earthquake 107 km N of Yakutat, Alaska came in on December 10, 2025 at 22:26 UTC. Coming 13 hours after a magnitude 3.7 earthquake in the immediate vicinity, it is most likely an aftershock of that larger rupture. At a depth of just 3.3 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: 60.512°, -139.630°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:26:27 UTC | 2.1ml | 59 km ESE of Pedro Bay, Alaska 59.654°, -153.088° | 103.4 km | - | - | - | ✓ Reviewed | USGS → |
The USGS recorded this magnitude 2.1 earthquake 59 km ESE of Pedro Bay, Alaska at 22:26 UTC on December 10, 2025. At a depth of 103.4 km, the event was intermediate depth. Coordinates: 59.654°, -153.088°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.1 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:17:27 UTC | 2.8md | 80 km N of San Juan, Puerto Rico 19.180°, -65.969° | 26.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.8 earthquake was recorded 80 km N of San Juan, Puerto Rico on December 10, 2025 at 22:17 UTC. This event falls inside the aftershock decay of a nearby magnitude 3.0 earthquake that occurred about 6 hours earlier. At a depth of 26.6 km, the event was shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 19.180°N, -65.969°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:17:11 UTC | 4.2ml | 148 km NNE of Ambler, Alaska 68.308°, -156.462° | 0.5 km | 1 | IV | - | ✓ Reviewed | USGS → |
Reports of a magnitude 4.2 earthquake 148 km NNE of Ambler, Alaska came in on December 10, 2025 at 22:17 UTC. Maximum shaking intensity peaked at MMI 4.5 (moderate). At a depth of just 0.5 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. A small number of nearby observers (1) submitted felt reports to the USGS. The epicenter is at 68.308°, -156.462°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M4.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:08:57 UTC | 3.2ml | 15 km NNE of Maeser, Utah 40.596°, -109.489° | 0.0 km | - | - | - | ✓ Reviewed | USGS → |
On December 10, 2025 at 22:08 UTC, a magnitude 3.2 earthquake struck 15 km NNE of Maeser, Utah. At a depth of just 0.0 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. Geolocation places the event at 40.596°N, -109.489°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M3.2 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 22:06:36 UTC | 2.0ml | 99 km S of Point Hope, Alaska 67.456°, -166.831° | 15.6 km | - | - | - | ✓ Reviewed | USGS → |
A magnitude 2.0 seismic event took place 99 km S of Point Hope, Alaska on December 10, 2025 at 22:06 UTC. It arrived roughly 1 hours after a larger magnitude 2.8 mainshock in the same 20 km area, placing it within the typical aftershock window. The event originated approximately 15.6 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. The epicenter is at 67.456°, -166.831°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 21:55:07 UTC | 2.6ml | 18 km NNW of Panguitch, Utah 37.972°, -112.530° | 8.8 km | 1 | - | - | ✓ Reviewed | USGS → |
On December 10, 2025 at 21:55 UTC, a magnitude 2.6 earthquake struck 18 km NNW of Panguitch, Utah. A small number of nearby observers (1) submitted felt reports to the USGS. The hypocenter lay at 8.8 km, placing this in the shallow crustal category. Coordinates: 37.972°, -112.530°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.6 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 21:39:49 UTC | 2.8ml | 96 km S of Point Hope, Alaska 67.481°, -166.765° | 10.1 km | - | - | - | ✓ Reviewed | USGS → |
Seismographs logged a magnitude 2.8 earthquake 96 km S of Point Hope, Alaska with origin time 21:39 UTC on December 10, 2025. The event originated approximately 10.1 km below the surface, classifying it as shallow crustal. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Coordinates: 67.481°, -166.765°. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.8 event page for the full report, ShakeMap, and citizen-reported intensity data. | ||||||||
2025-12-10 2025-12-10 21:39:19 UTC | 2.0ml | 115 km N of Yakutat, Alaska 60.567°, -140.110° | 1.3 km | - | - | - | ✓ Reviewed | USGS → |
December 10, 2025 brought a magnitude 2.0 earthquake 115 km N of Yakutat, Alaska, logged at 21:39 UTC. This event falls inside the aftershock decay of a nearby magnitude 4.7 earthquake that occurred about 10 hours earlier. At a depth of just 1.3 km, this was a very shallow event, close enough to the surface that modest magnitudes can produce significant local shaking. The event was offshore — common for earthquakes along subduction zones and transform plate boundaries. Geolocation places the event at 60.567°N, -140.110°E. The solution has been reviewed by a USGS seismologist and is considered finalized. See the M2.0 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 December 10, 2025. Data includes all events of magnitude 1.0 or greater. Past earthquake data is considered final after review by USGS seismologists.