Auxiliary Material for
Fluid-injection induced seismicity reveals a NE-dipping fault in the south-eastern
sector of the High Agri Valley (southern Italy)
T. A. Stabile1, A. Giocoli1,2, A. Perrone1, S. Piscitelli1, and V. Lapenna1
(1Consiglio Nazionale delle Ricerche, Istituto di Metodologie per l’Analisi
Ambientale (CNR-IMAA), Tito, Italy; 2Now at: Agenzia nazionale per le nuove
tecnologie, l’energia e lo sviluppo economico sostenibile (ENEA), Rome, Italy)
Geophysical Research Letters, 2014
Introduction
These supporting materials show the 3D spatial distribution (Animation S1) of fluidinjection induced seismicity, located near the Costa Molina 2 injection well at NE of
the Pertusillo Lake (High Agri Valley, southern Italy), and its space-time evolution
along and perpendicular to the strike of the inferred fault (Animation S2).
We also show the cumulative number of earthquakes occurred to the NE and SW of
the Pertusillo Lake versus the water level fluctuations of the lake during the
investigated period (Figure S1).
1. ms01.avi (Animation S1) 3D spatial distribution of the fluid-injection induced
seismicity analyzed in this study. The seismicity is projected on the vertical cross
section perpendicular to the strike of a hypothetical fault varying from 190˚ to 360˚
with rotation step of 10˚. It is possible to observe the alignment of microearthquakes
on a fault with strike = 310˚, which is consistent with the focal mechanism of the
largest event of the cluster (Ml = 2.0) discussed in the paper.
2. ms02.avi (Animation S2) Space-time evolution of the induced seismicity projected
on two vertical cross sections perpendicular (top panel) and parallel (bottom panel) to
the N310˚ trending fault, respectively. The projection of the injection well is
displayed with a blue line. The origin time and local magnitude Ml of each occurring
event (visualized in the animation with a red dot) is indicated on the top right of each
panel. Horizontal and vertical location errors of induced microearthquakes are also
displayed. It is possible to observe that events initially occur close to the first event
inside AP, and overcome the AP-AU boundary (horizontal dashed line in the
animation) with the 25 July 2006, Ml = 1.4 event.
3. fs01.pdf (Figure S1) Cumulative number of events of (a) the NE cluster and (b) the
SW cluster displayed in Figure 1 versus the water level fluctuations of the Pertusillo
Lake during the investigated period. The injection began in June 2, 2006 (vertical
dashed line). It is possible to observe a rapid increase of seismicity belonging to the
NE cluster after the start of the injection.