Mount Pelée shows heightened seismic activity, prompting renewed eruption warnings

Mount Pelée, the volcano that devastated Saint-Pierre in 1902, has entered a period of increased seismic unrest. The Martinique Volcanological and Seismological Observatory detected 124 earthquakes from July 24 to July 31, roughly three times the number recorded the week before, and a total of 331 volcanic quakes for the month, comparable to a 2019 surge. These tremors, all below magnitude 1 and unnoticed by the public, are linked to rock fracturing from rising magma or hydrothermal fluids, according to the Pacific Northwest Seismic Institute.

In addition, several inches of summit ground movement have been measured each month since May, attributed to inflation of a deformation zone about 0.6 miles beneath the peak. Although the short-term likelihood of an eruption is deemed low, the observatory has upgraded the alert level to yellow, indicating that medium-term activity cannot be ruled out. Residents of Martinique, home to roughly 400,000 people, could face pyroclastic flows and ashfall disruptions if the volcano were to erupt again.