What do the earthquake magnitude numbers mean?

M 2.0-2.9 is minor and rarely felt. M 3.0-3.9 is light, like a passing truck. M 4.0-4.9 is moderate, causing light shaking and rattling windows but unlikely to cause significant damage.

What do the map overlays mean?

The 'Risk Zones' highlight the concentration of seismic energy. The 'Hypothetical Fault Line' is an interpretation based on the alignment of the epicenters, suggesting the likely orientation of the underground fault.

What should you do during an earthquake?

Follow the 'Drop, Cover, and Hold On' protocol. DROP to your hands and knees. COVER your head and neck under a sturdy table. HOLD ON to your shelter until the shaking stops.

Johor Earthquake Swarm

August 24 - October 05, 2025

For one week in August 2025, the ground in Johor trembled. This interactive analysis lets you step through the Segamat earthquake swarm, event by event. Explore the data, animate the seismic waves, and uncover the patterns that help scientists forecast, but not predict, these powerful natural events.

Event Timeline

Slide or press play

Map Layers

Risk Zones Hypothetical Fault Line Major Cities Historical Context

Map Overlays Explained

Risk Zones:

These zones are generated based on the density and magnitude of the earthquake epicenters. The inner, darker zone indicates a higher statistical probability of seismic stress, while the outer zone represents a broader area of influence.

Hypothetical Fault Line:

This dashed line represents a linear regression (a 'best-fit' line) calculated from the coordinates of all earthquake epicenters. It suggests the most probable orientation of the underlying fault system responsible for this seismic swarm.

Magnitude Explained

M 2.0-2.9: Minor. Rarely felt by people, but can be recorded by seismographs.

M 3.0-3.9: Light. Often felt, but rarely causes damage. Vibration is like a passing truck.

M 4.0-4.9: Moderate. Light shaking, rattling windows. Unlikely to cause significant damage.

Safety & Preparedness

During an earthquake, remember to:

DROP to your hands and knees. This position prevents you from being knocked down.

COVER your head and neck under a sturdy table or desk.

HOLD ON to your shelter until the shaking stops. Be prepared to move with it.

Data Sources

Malaysian Meteorological Department (METMalaysia)
Department of Mineral and Geoscience Malaysia (JMG)
US Geological Survey (USGS) for historical data

For educational purposes only. Always refer to official government sources for safety information.

Welcome to the Interactive Earthquake Map

Disclaimer for Educational Use

Johor Earthquake Swarm

Event Timeline

Map Layers

Data Sources