A magnitude-7.4 earthquake [1] struck San José del Palmar in the Chocó department of Colombia on Monday, Aug. 10 [3].
The event highlights the ongoing volatility of the Pacific Ring of Fire and the vulnerability of Colombian infrastructure to deep-seated tectonic shifts.
The earthquake occurred at approximately 7:40 a.m. local time [4]. According to geological data, the quake resulted from the subduction of the Nazca plate beneath the South American plate [1]. This process occurred at a hypocentre depth of approximately 103 km [2].
Scientists said that site-effects amplified the shaking across various regions of Colombia [1]. The interaction between these two massive tectonic plates creates significant pressure that is released during such seismic events, often resulting in prolonged shaking.
Following the main shock, officials said there were 99 aftershocks [5]. These secondary tremors are common after a major release of energy in a subduction zone as the earth's crust adjusts to the new position of the plates.
San José del Palmar served as the epicentre of the disaster [6]. The region is known for its complex geography, which can influence how seismic waves travel through the ground and impact local communities [6].
“A magnitude-7.4 earthquake struck San José del Palmar in the Chocó department of Colombia.”
This event underscores the persistent seismic risk in Colombia due to its location on the boundary of the Nazca and South American plates. The depth of the hypocentre and the subsequent volume of aftershocks indicate a significant adjustment in the tectonic boundary, reminding regional planners that high-magnitude events can occur even in remote departments like Chocó.
