At 23:59 (BJT) on 18 December 2023, a 6.2-magnitude earthquake struck Jishishan County, Linxia Zhou, Gansu province, with a depth of 10 km. The earthquake resulted in the tragic loss of 113 lives, injuries to 536 individuals, and extensive damage to 155,393 houses, as reported as of 13:00 (BJT) on 22 December 2023. In response, the CBAS initiated emergency mapping activities in the affected areas, and planned the transit of SDGSAT-1 to obtain the nighttime light and synchronize thermal infrared spectrometer (TIS) data within one day after the earthquake.

This report provided the impact of the Earthquake and the information of relief activities via the differences of nighttime light. The increase of nighttime light showed that the emergency responses and relief activities were well orgainized in time. Within one week, the light intensity of most earthquake-affected areas has been largely restored.

IRDR reviewed this report based on the information collected onsite.

IRDR and CBAS will continue the monitoring of the recovery efforts.