Articles about earthquakes, seismology, and how seismic data works.
Open an earthquake map and the density of dots can be unsettling. But a crowded map reflects detection capabilities, aftershock sequences, and magnitude thresholds more than danger.
When an earthquake happens, the first public information often appears within minutes. That speed depends on a tightly coordinated chain of instruments, algorithms, and reporting systems.
Offshore earthquakes begin beneath the ocean floor, often along tectonic plate edges. They can damage coastal communities and generate tsunamis that travel across oceans.
Earthquakes cluster in belts and corridors that reflect the location of fault lines. Understanding fault types helps explain why some areas are seismically active.
Two earthquakes with similar magnitudes can feel completely different. The difference comes from depth, distance, local geology, building type, and shaking frequency.
When an earthquake first appears in a monitoring feed, the magnitude is a preliminary estimate. That number often changes as more data arrives and different methods are applied.
An earthquake location is not measured directly. It is estimated from wave arrivals recorded across a seismic network, then refined as more data becomes available.
Most earthquakes never make the news, yet seismologists pay close attention to them. These tiny events form one of the richest data sources in earthquake science.