TY  - JOUR
ID  - epos165
UR  - http://dx.doi.org/10.5194/npg-17-293-2010
IS  - 4
A1  - Cho, N. F.
A1  - Tiampo, Kristy F.
A1  - Mckinnon, S. D.
A1  - Vallejos, J. A.
A1  - Klein, W.
A1  - Dominguez, R.
Y1  - 2010/07/02/
N2  - The Thirulamai-Mountain (TM) metric was ?rst
developed to study ergodicity in ?uids and glasses (Thiru-
malai and Mountain, 1993) using the concept of effective
ergodicity, where a large but ?nite time interval is consid-
ered. Tiampo et al. (2007) employed the TM metric to earth-
quake systems to search for effective ergodic periods, which
are considered to be metastable equilibrium states that are
disrupted by large events. The physical meaning of the TM
metric for seismicity is addressed here in terms of the cluster-
ing of earthquakes in both time and space for different sets of
data. It is shown that the TM metric is highly dependent not
only on spatial/temporal seismicity clustering, but on the past
seismic activity of the region and the time intervals consid-
ered as well, and that saturation occurs over time, resulting in
a lower sensitivity to local clustering. These results con?rm
that the TM metric can be used to quantify seismicity clus-
tering from both spatial and temporal perspectives, in which
the disruption of effective ergodic periods are caused by the
agglomeration of events.
PB  - American Geophysical Union
JF  - Nonlinear Processes in Geophysics
VL  - 17
SN  - 1607-7946
TI  - A simple metric to quantify seismicity clustering
SP  - 293
AV  - none
EP  - 302
ER  -