In Guam there are partly large earthquakes with strengths of more than 7.0, which cause damages within a radius of over 100 kilometers. Due to the special tectonic situation of the country, there are more earthquakes than average.
The strongest earthquake in Guam happened on 08/08/1993 in the region Tuman Bay, Apra Harbor with a magnitude of 7.8 on the Richter scale. The earthquake also triggered a tsunami with further victims and destructions.
Tuman Bay, Apra Harbor
These statistics are based on datas from the National Geophysical Data Center / World Data Service (NGDC/WDS): Significant Earthquake Database. doi:10.7289/V5TD9V7K. Several data have been summarized and translated.