Moderate 5.4 Earthquake Near Fern Forest, United States
A moderate magnitude 5.4 earthquake struck 15 km SSE of Fern Forest, United States on Tuesday, August 14, 2007 at 05:38:06 AM UTC. This shallow crustal event (9.2 km depth) released energy equivalent to approximately 1.9 kt of TNT. Here is the verified HV telemetry, live epicenter map, and ground shaking assessment.
(15 km SSE of)Seismic Telemetry Specifications
5.4MD
Moderate Seismic Class
9.2km
Crustal Layer
19.345° N, 155.069° W
GPS Coordinates
1.9 kt
TNT Equivalent Power
HV
USGS Real-time Feed
Epicenter Location & Tectonic Fault Map
Is This Earthquake Dangerous?
A magnitude 5.4 event is classified as a moderate earthquake. Can cause slight to moderate damage to poorly constructed buildings. Felt widely across nearby communities within dozens of kilometers.
Estimated Shaking Across Nearby Communities
Difficult to stand. Damage negligible in good buildings; slight to moderate in ordinary structures.
Did You Feel This Earthquake?
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What Does Magnitude 5.4 Mean?
Earthquake strength is measured on a logarithmic scale. Compare this event with the full seismic scale:
Logarithmic Energy Multiplier
Because seismic scales are logarithmic, each whole integer increase represents:
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 9.2 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
Following an earthquake of magnitude 5.4, an active aftershock sequence is expected over the coming days and weeks. In accordance with Omori's Law and Båth's Law of seismology, secondary tremors decrease in frequency over time, with the largest expected aftershock historically averaging approximately 1.0 to 1.2 magnitude units below the mainshock. Local residents should remain vigilant for secondary shaking, particularly when inspecting older structures or unreinforced masonry.
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Earthquake Safety Action Plan
Complete Safety Guide →- •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.
- •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.
- •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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