An earthquake that is distant (usually more than 20 degrees) from the recording station.
A teleseism is the tremor caused by an earthquake that is very far away. According to the USGS, the term, teleseismic refers to earthquakes that occur more than 1000 km from the measurement site. Often teleseismic events can be picked up only by seismometers that are in low background noise locations; whereas, in general, a tremor of a magnitude 5...
tremor due to a very distant earthquake
• (n.) A seismic movement or shock far from the recording instrument.
Tel'e·seism noun [ Greek 
teleseism, teleseismic An earthquake that occurs in a part of the world far away from a recording station.
An earthquake that is distant from the recording station.