Magnitude 7.7 earthquake strikes offshore southern Panama

Overview

Updated 1 hour ago

A magnitude 7.7 earthquake struck offshore southern Panama on October 9, 2026, at 17:56 UTC (Coordinated Universal Time). The quake hit 12 kilometers west-southwest of Pitaloza Arriba at a depth of 33 kilometers, in the Pacific Ocean south of the Azuero Peninsula.

The U.S. Geological Survey first reported the quake as magnitude 8.0 and revised it to 7.7. Its PAGER system issued a red alert, its highest level for expected casualties and losses. The Cocos plate subducts beneath the Panama microplate here. An event of this size carries tsunami potential for Pacific coastlines from Costa Rica to Colombia.

Why it matters

A magnitude 7.7 earthquake in this subduction zone can generate a tsunami on nearby Pacific coasts and cause severe damage across southern Panama and Costa Rica.

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Key Indicators

7.7

Earthquake magnitude

Revised by the USGS from an initial 8.0; a major subduction earthquake.

33 km

Hypocenter depth

Moderate depth for a subduction zone event, consistent with a megathrust rupture.

~700

Annual quakes in region

Average number of earthquakes per year within 100 km of the epicenter area.

Voices

Curated perspectives — historical figures and your fellow readers.

Ever wondered what historical figures would say about today's headlines?

Organizations Involved

United States Geological Survey

Federal scientific agency

Reported the earthquake and monitors aftershocks

The USGS National Earthquake Information Center reported the M 7.7 event and tracks the aftershock sequence.

Instituto Geográfico Nacional Tommy Guardia

National geographic and seismological institute

Panama's national seismic monitoring agency

Panama's IGC reviews and catalogs earthquakes in the region, including the recent M 3.0 and M 3.7 events.

European-Mediterranean Seismological Centre

International seismological organization

Independent seismic monitoring network

EMSC reported the M 3.7 earthquake on October 8 and provides independent seismic monitoring for the region.

Timeline

4 events Latest: Today

Tap a bar to jump to that date

October 2026
M 3.0 earthquake on Panama-Costa Rica border
Today Seismic Event

A magnitude 3.0 quake struck the Panama-Costa Rica border region at 14 km depth.
Today • 13:57 UTC
M 7.7 earthquake strikes offshore southern Panama
Today Seismic Event

A magnitude 7.7 quake hit 12 km west-southwest of Pitaloza Arriba at 33 km depth.
Today • 17:56 UTC
M 3.7 earthquake southwest of David
Seismic Event

A magnitude 3.7 quake struck 55 km southwest of David at 14 km depth.
Yesterday • 22:13 UTC
M 5.0 earthquake south of Burica Peninsula
Seismic Event

A magnitude 5.0 quake struck 295 km south of Burica, Panama, at 10 km depth.
5 days ago • 14:06 UTC

Scenarios

Tsunami warning issued, coastal damage reported

Likely Resolves by Oct 10, 2026

Discussed by: Pacific Tsunami Warning Center, NOAA

An M 7.7 at 33 km depth in a subduction zone is capable of generating a significant tsunami. The Pacific Tsunami Warning Center would issue warnings for Pacific coastlines from Mexico to Colombia. Wave heights and coastal flooding would be measured within hours.

Significant casualties and infrastructure damage in Panama

Likely Resolves by Oct 16, 2026

Discussed by: SINAPROC (Panama's national civil protection system), USGS PAGER

An M 7.7 would produce strong to severe shaking across southern Panama. The USGS PAGER system would estimate casualties and economic losses. Panamanian authorities would report damage to buildings, roads, and ports in the affected region.

Aftershock sequence includes additional M 6+ events

Likely Resolves by Nov 9, 2026

Discussed by: USGS, EMSC

After an M 7.7 megathrust event, the aftershock sequence typically includes multiple M 6 and possibly M 7 events in the following days and weeks. The USGS would catalog these events and update its aftershock forecast.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

April 1983

Osa-Burica earthquake (1983)

A magnitude 7.4 earthquake struck the Osa-Burica region on the Costa Rica-Panama border, a thrust-type event from the subduction of the Cocos plate beneath the Panama microplate.

Then

The quake caused significant damage in the border region and was felt across southern Costa Rica and western Panama.

Now

It remains one of the largest recorded earthquakes in the region and a reference point for seismic hazard assessment.

Why this matters now

The 1983 event occurred in the same subduction system as the 2026 M 7.7.

July 1934

Panama Fracture Zone earthquake (1934)

A magnitude 7.6 earthquake struck along the Panama Fracture Zone, the transform boundary between the Cocos and Nazca plates, producing a large strike-slip event.

Then

The quake was felt across the region and caused damage in coastal areas.

Now

It demonstrated the seismic hazard posed by the fracture zone, which remains active today.

Why this matters now

The 1934 event is the main historical comparison for the 2026 M 7.7 in the same region.

May-June 2019

Laurel and Manaca earthquakes (2019)

Two strong earthquakes, magnitude 6.0 on May 12 and magnitude 6.2 on June 26, struck near the Costa Rica-Panama border, with epicenters on the continent near Laurel and Manaca Civil, Chiriquí.

Then

Both events were strongly felt by residents near the border, reaching intensity V-VI on the Modified Mercalli Scale, without casualties or major structural damage.

Now

Detailed study of these events revealed the complex transition from subduction to strike-slip motion at the Panama Triple Junction.

Why this matters now

The 2019 events provided the most recent detailed picture of the region's tectonic complexity before the 2026 M 7.7.