Earth Changes · Daily Report · October 20, 2026, 6:30 AM CDT
A magnitude 6.3 earthquake struck 197 km NW of Port-Olry, Vanuatu at 4:20 a.m. UTC on Oct. 20, about 16 km (≈10 miles) below the surface, the U.S. Geological Survey reports[1]. The USGS PAGER system rates the expected impact GREEN. USGS flags it as an ocean-area quake, so check tsunami.gov for any official tsunami message. It was one of 23 quakes of magnitude 4.5 or greater in the past day.
Meanwhile, Great Sitkin volcano is at alert level WATCH (aviation color code ORANGE), the Alaska Volcano Observatory says. Its latest update: “Slow eruption of lava within the summit crater continues.”[2]
Elsewhere, the National Weather Service has 18 severe or extreme alerts in effect, led by 8 flood watches across AK, AZ.[3]
Today at a Glance
- 23 earthquakes of magnitude 4.5 or greater, the largest M6.3
- 18 severe or extreme U.S. weather alerts
- 4 U.S. volcanoes above normal, including Great Sitkin
- 3 sinkhole reports in the news
Could not be reached for this edition: Smithsonian weekly volcano report.
Where It’s Happening
Numbered pins match the list under the map. Storm and quake pins are the agencies' reported centers; sinkhole pins mark the town named in the report. Map data: OpenStreetMap contributors.
1. Extreme Weather
The National Hurricane Center is tracking no active tropical storms.[4]
Across the United States, the National Weather Service has 18 alerts rated severe or extreme in effect.[3]
| Alert | Number | States |
|---|---|---|
| Flood Watch | 8 | AK, AZ |
| Winter Storm Warning | 4 | AK |
| Coastal Flood Warning | 2 | NC |
| Flood Warning | 2 | FL, GA |
| High Wind Warning | 1 | AK |
| Storm Warning | 1 | PK |
The Storm Prediction Center says no severe thunderstorm areas are forecast today.[5]
Around the world, GDACS logged 76 wildfire, 4 earthquake, 4 flood notices in the past two days, all at its lowest (Green) level.[6]
Video: TRT World, Turkey's public English-language broadcaster, verified Telegram channel, October 20, 2026 — “Emergency service helicopters were deployed to rescue people stranded on rooftops as torrential rains and severe flooding swept across eastern Spain on October 19, killing at least four people and prompting shelter-in-pl” Topic: flood. Picked by hazard keywords in the channel’s own caption. Telegram only plays this file in its app: use the button above.
2. Earthquakes
The USGS recorded 23 earthquakes of magnitude 4.5 or greater in the past 24 hours.[7] The strongest:
| Mag. | Where | When | Depth | PAGER |
|---|---|---|---|---|
| 6.3 | 197 km NW of Port-Olry, Vanuatu | Oct. 20, 4:20 a.m. UTC | 16 km | GREEN |
| 5.7 | 203 km WNW of Port-Olry, Vanuatu | Oct. 19, 6:55 p.m. UTC | 10 km | GREEN |
| 5.7 | 198 km NW of Port-Olry, Vanuatu | Oct. 19, 6:52 p.m. UTC | 10 km | GREEN |
| 5.3 | 116 km WNW of Höfn, Iceland | Oct. 19, 2:44 p.m. UTC | 10 km | — |
| 5.2 | 206 km NW of Port-Olry, Vanuatu | Oct. 20, 6:29 a.m. UTC | 10 km | — |
| 5.1 | 263 km WSW of Yanglong, China | Oct. 20, 6:41 a.m. UTC | 10 km | — |
| 5.1 | South Sandwich Islands region | Oct. 19, 5:45 p.m. UTC | 101 km | — |
| 5.0 | 81 km S of Sand Point, Alaska | Oct. 20, 10:40 a.m. UTC | 35 km | — |
PAGER is the USGS estimate of likely deaths and damage: GREEN means little or none expected, RED means extensive. A dash means none was issued.
Earlier this week: The USGS is also continuing to monitor ongoing aftershocks and impacts from significant earthquakes recorded over the past seven days:[8]
| Mag. | Where | When | Depth | PAGER |
|---|---|---|---|---|
| 6.9 | 76 km NE of Ozernovskiy, Russia | Oct. 16, 3:35 a.m. UTC | 135 km | GREEN |
| 6.8 | central Mid-Atlantic Ridge | Oct. 13, 12:23 p.m. UTC | 10 km | GREEN |
| 5.7 | 48 km WNW of Khuzdar, Pakistan | Oct. 17, 5:06 a.m. UTC | 10 km | YELLOW |
3. Volcanoes
In the United States, 4 volcanoes are above normal background activity, according to the U.S. Geological Survey’s observatories:
| Volcano | Alert / aviation code | Latest word from scientists |
|---|---|---|
| Great Sitkin | Watch / Orange | Slow eruption of lava within the summit crater continues.[2] |
| Ahyi Seamount | Advisory / Yellow | Plumes of discolored water seen in satellite imagery; no significant geophysical signals.[9] |
| Kilauea | Advisory / Yellow | The Halema'uma'u eruption of Kīlauea is currently paused after episode 55 fountaining ended on October 17. Summit reinflation continues today.[10] |
| Shishaldin | Advisory / Yellow | Low-level unrest continues.[2] |
Alert levels run Normal, Advisory, Watch, Warning. Aviation codes run Green, Yellow, Orange, Red.
4. Sinkholes
No government agency publishes a live national sinkhole feed, so these come from today’s local news:
- Easthampton, Massachusetts: The Cool Down reports, “Two sinkholes on Ferry Street in Easthampton, Massachusetts, led crews to a broken underground pipe.”[11]
- Saint Clairsville, Ohio: WTOV reports, “Sinkhole expands across St. Clairsville road, forcing closure ST. CLAIRSVILLE, Ohio — What started as a small hole on Country Club Road in St. Clairsville in late August has grown into a major sinkhole that has shut down the road indefinitely, forcing drivers to take longer detours and raising concerns about how long repairs could take.”[12]
- CBS News reports, “Permanent roadway restoration underway in West Hollywood months after water main break caused sinkhole Crews in West Hollywood are set to begin working on permanent roadway restoration on Monday, months after a water main break caused a sinkhole on Sunset Boulevard.”[13]
Also in the News
Other natural-hazard video from the past day, from news organizations:
Video: Reuters, October 20, 2026 — “Australian barber hailed a hero after rushing to lawmaker's aid”. Also in the news. Picked because its title names a natural hazard; it may not be covered in the data above.
Video: Reuters, October 20, 2026 — “Inside Ivory Coast's cocoa farms, still reeling from a 2024 heat storm”. Also in the news.
5. What the Experts Say
These are the words of the scientists and forecasters who watch these hazards for a living, quoted exactly.
“No severe thunderstorms are forecast across the U.S. today and tonight.”
— NOAA Storm Prediction Center[5]
“The eastern margin of the Australia plate is one of the most sesimically active areas of the world due to high rates of convergence between the Australia and Pacific plates. In the region of New Zealand, the 3000 km long Australia-Pacific plate boundary extends from south of Macquarie Island to the southern Kermadec Island chain. It includes an oceanic transform (the Macquarie Ridge), two oppositely verging subduction zones (Puysegur and Hikurangi), and a transpressive continental transform, the Alpine Fault through South Island, New Zealand.”
— U.S. Geological Survey, “Seismotectonics of the Eastern Margin of the Australia Plate,” on the region around the M6.3 quake[14]
“Lava continues to erupt slowly within the summit crater of Great Sitkin Volcano. A few small earthquakes were detected in the past day. Satellite and webcam views were obscured by clouds.”
— Alaska Volcano Observatory, on Great Sitkin[2]
“Plumes of discolored water were seen in the ocean above Ahyi on October 9 and 11 this past week. Discolored greenish water was visible drifting more than 7 km from the summit of Ahyi. These plumes are likely associated with degassing and hydrothermal activity at the summit of the underwater volcano.”
— Northern Mariana Islands, on Ahyi Seamount[9]
“Sinkholes are common where the rock below the land surface is limestone, carbonate rock, salt beds, or other rocks that can naturally be dissolved by groundwater circulating through them. As the rock dissolves, spaces and caverns develop underground. Sinkholes are dramatic because the land usually stays intact for a while until the underground spaces just get too big.”
— U.S. Geological Survey Water Science School, on why sinkholes form[15]
How to Prepare
- Keep a basic kit: water (one gallon per person per day for several days), food, a battery or hand-crank radio, a whistle, a dust mask and phone chargers.[16]
- Get alerts: Wireless Emergency Alerts need no sign-up; the FEMA app, NOAA Weather Radio, the USGS Earthquake Notification Service and the USGS Volcano Notification Service are free.
- Floods: Turn Around, Don’t Drown. Six inches of moving water can knock you down, and one foot can sweep a car away.[17]
- Earthquakes: Drop, Cover and Hold On.[18]
- Download the checklist: Be Ready: Earthquakes, Volcanoes, Extreme Weather and Sinkholes (PDF), with today’s active hazards first.
How to Verify This Yourself
- Earthquakes: USGS Latest Earthquakes map
- U.S. volcanoes: USGS Volcano Hazards Program; world: Smithsonian weekly report
- Weather alerts: weather.gov/alerts; tropics: nhc.noaa.gov
- Worldwide disasters: gdacs.org
References
- USGS, M6.3 197 km NW of Port-Olry, Vanuatu event page earthquake.usgs.gov. ↩
- Alaska Volcano Observatory, Great Sitkin notice volcanoes.usgs.gov. ↩
- National Weather Service, active alerts API api.weather.gov. ↩
- National Hurricane Center, active storms data nhc.noaa.gov. ↩
- NOAA Storm Prediction Center, Day 1 Convective Outlook spc.noaa.gov. ↩
- GDACS, Global Disaster Alert and Coordination System gdacs.org. ↩
- USGS, M4.5+ earthquakes, past day (real-time feed) earthquake.usgs.gov. ↩
- USGS, Significant earthquakes past week (real-time feed) earthquake.usgs.gov. ↩
- Northern Mariana Islands, Ahyi Seamount notice volcanoes.usgs.gov. ↩
- Hawaiian Volcano Observatory, Kilauea notice volcanoes.usgs.gov. ↩
- The Cool Down, In Massachusetts, 2 sinkholes led crews to a buried 7-foot pipe, and repairs may take weeks thecooldown.com. ↩
- WTOV, Sinkhole expands across St. Clairsville road, forcing closure wtov9.com. ↩
- CBS News, Permanent roadway restoration underway in West Hollywood months after water main break caused sinkhole cbsnews.com. ↩
- USGS Geoserve, tectonic summary earthquake.usgs.gov. ↩
- USGS Water Science School, Sinkholes usgs.gov. ↩
- Ready.gov (FEMA), Build a Kit ready.gov. ↩
- Ready.gov (FEMA), Floods ready.gov. ↩
- Ready.gov (FEMA), Earthquakes ready.gov. ↩
Methodology: this report is assembled automatically each morning from the live data feeds of the USGS, the Smithsonian Global Volcanism Program, the National Weather Service, the National Hurricane Center, the Storm Prediction Center and GDACS, plus same-day news reports for sinkholes. No AI writes it: the sentences are fixed templates filled with that data, and every quote is copied exactly from the source it is credited to. Data can change after publication; follow the links for the latest.
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