Abstract:
A detailed investigation of the hypocenter distribution beneath Elbasani, Albania, reveals
a NE-SW-trending linear alignment of seismicity within the Elbasani-Dibra transversal zone. In
the zone of Elbasani, hot mineral water (thermal waters) spot out from natural springs which
have been known since the 19th century. We estimate the 3D seismic velocity structure in the
Elbasani zone to understand the factors controlling the genesis of such earthquakes. A narrow
low-velocity zone is imaged within the transversal fault zone over a length of ∼50 km, which
partly penetrates into the mantle. The low-velocity zone correlates in space with the NE-SW
trending earthquake cluster. A reactivation of thermal water fracture zone is probably related to
the low-velocity anomaly.Where geological conditions are favourable, rainwater seeps through
the surface and becames trapped in vast underground reservoirs so deep below the Earth”s
surface that it becomes heated to high temperatures by the LVFZ. The typology of earthquakes
in Elbasan-Dibra comprises all three main well-known types of earthquakes: the earthquakes
with main-shock followed by aftershocks, the earthquakes with foreshocks, the compound
earthquakes, and the swarms. Seismic hazard for series of earthquakes in this urban area is very
high and direct connection with the geology and hydrogeology of the location.
