1. Unexplained luminous phenomena observed in the sky or near the ground, often associated with tectonic activity or geological stress; also called earthquake lights.
Usage: plural form; scientific/geological context; sometimes capitalized when referring to specific documented events

Examples

• Witnesses reported seeing earthlights in the sky hours before the earthquake struck.
• Scientists have documented earthlights appearing during periods of significant seismic activity.
• The earthlights phenomenon remains poorly understood by geologists.
• Historical records describe earthlights observed before major tremors in various regions.
• Researchers are studying the connection between earthlights and underground geological stress.