The hydrophones are able to detect even very small earthquakes ( magnitude 1.8) by listening for the acoustic waves generated by T-waves.

On instruments for detecting earthquakes, such a blast would measure a magnitude of about 4, like a small tremor.

"They can detect earthquakes."

The Canadian National Seismograph Network is a network of seismographs to detect earthquakes across Canada.

The school subsequently made the local news when the seismograph in the school's science center detected earthquakes in Martinique and elsewhere.

An underground observation tunnel is used to detect volcanic earthquakes more reliably.

Seismometers detect earthquakes which occur immediately beneath the crater, signaling the onset of the eruption.

As the Royal Observatory, Hong Kong did not start operating long-period seismographs until 1921 to detect distant earthquakes.

We have the technology to detect earthquakes in the world's danger spots.

First, we need a global early warning system to detect earthquakes and tsunamis.