M2.3 Earthquake Near Round Valley, United States

Published: 25 days ago•Tuesday, September 29, 2026 at 12:18 PM UTC

A micro magnitude 2.3 earthquake struck 2 km SSW of Round Valley, United States at a shallow crustal depth of 11.8 km, releasing seismic energy equivalent to approximately 46 kg of TNT. Here is the verified NC telemetry, interactive epicenter map, and ground shaking assessment.

2.3MAG
Micro EarthquakeShallow Crustal Event
Round Valley, United StatesUnited States(2 km SSW of)

Seismic Telemetry Specifications

Magnitude

2.3MD

Micro Seismic Class

Focal Depth

11.8km

Crustal Layer

Epicenter

37.401° N, 118.607° W

GPS Coordinates

Energy Yield

46 kg

TNT Equivalent Power

Network Source

NC

USGS Real-time Feed

Epicenter Location & Tectonic Fault Map

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USGS Source

Is This Earthquake Dangerous?

A magnitude 2.3 event is classified as a micro earthquake. Micro-earthquakes are rarely felt by humans and are typically recorded only by sensitive seismometers.

Estimated Shaking Radius< 10 km
Potential Damage ZoneNone
Focal Depth EffectHigh Surface Energy (Crustal)

Estimated Shaking Across Nearby Communities

Round Valley, United States• 2 km (1.2 mi) N

Felt indoors. Hanging objects swing slightly. Vibration like a passing light truck.

MMI III • Weak

Did You Feel This Earthquake?

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What Does Magnitude 2.3 Mean?

Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:

1.0 – 2.9Micro
This Event
3.0 – 3.9Minor
4.0 – 4.9Light
5.0 – 5.9Moderate
6.0 – 6.9Strong
7.0 – 7.9Major
8.0+Great

Logarithmic Energy Multiplier

Because seismic scales are logarithmic, each whole integer increase represents:

10× Ground Motion Amplitude
The seismograph wave amplitude jumps tenfold for every 1.0 magnitude step.
~31.6× Radiated Kinetic Energy
Total energy release multiplies exponentially (101.5 &approx; 31.62 times per unit).

Why Did This Earthquake Happen?

United States's seismicity is fundamentally governed by its tectonic setting: Pacific Plate sliding past North American Plate along San Andreas; Juan de Fuca subducting along Cascadia; Pacific subduction along the Aleutian Trench. Major regional fault structures include San Andreas Fault System, Cascadia Subduction Zone, Aleutian Megathrust, Hayward Fault, New Madrid Seismic Zone.

Originating at a depth of 11.8 km (Earth's Crust (0–70 km)), this rupture occurred occurred within the brittle upper crust. shallow earthquakes produce the highest peak ground acceleration and the sharpest surface shaking.

Aftershock Outlook & Secondary Tremors

Micro-tremors and minor events of this scale are part of ongoing background tectonic relaxation. While isolated micro-aftershocks may occur, the likelihood of a damaging secondary event remains statistically low under normal seismic conditions.

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Earthquake Safety Action Plan

Complete Safety Guide →
During the Shaking
  • •Drop, Cover, and Hold On: Take cover beneath a sturdy table or desk.
  • •Stay indoors away from exterior glass windows and heavy unanchored fixtures.
  • •If outdoors, move into an open area away from power lines and building facades.
Immediately After
  • •Inspect utilities for damaged gas lines, water leaks, or electrical hazards.
  • •Expect Aftershocks: Secondary tremors frequently strike after significant events.
  • •Avoid damaged structures and listen to official emergency broadcasts.
Preparation & Kits
  • •Maintain a 72-hour emergency go-bag with water, food, and first aid.
  • •Anchor heavy furniture, water heaters, and appliances to structural studs.
  • •Establish a family emergency communication protocol and meeting point.

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