16 research outputs found
Asymptotic analysis of the Skyrmed monopole
We consider a variant of the Georgi Glashow model in the BPS limit, augmented
by a higher derivative Skyrme-like term, which is the simplest YMH model that
can support monopole bound states. The spherically symetric solutions are
studied with a combination of analytic and numerical techniques, which strongly
suggest that the solutions converge to a finite energy configuration in the
limit of infinite coupling of the Skyrme-like term.Comment: 6 pages, 3 figures, references added, discussion extende
Seismicity patterns before the M=5.8 2002, Palermo (Italy)earthquake: seismic quiescence and accelerating seismicity
Seismic quiescence and accelerating seismic energy release are considered as possible spatio-temporal patterns of the
preparation process of the 6 September 2002 Palermo, Italy, earthquake (M 5.8). The detailed properties of the quiescence are
analyzed applying the RTL algorithm. The RTL algorithm is based on the analysis of the RTL prognostic parameter, which is
designed in such a way that it has a negative value if, in comparison with long-term background, there is a deficiency of events
in the time–space vicinity of the tested point. The RTL parameter increases if activation of seismicity takes place. The RTL
algorithm identified that a seismic quiescence started from the beginning of November 2001 and reached its minimum at the end
of May 2002. The Palermo 2002 earthquake occurred 2 months after the RTL parameter restored its long-term background
level. The application of a log-periodic time-to-failure model gives a ‘‘predicted’’ (in retrospect) magnitude M= 6.2 main shock
on 5 May 2002
Seismicity patterns before the M=5.8 2002, Palermo (Italy)earthquake: seismic quiescence and accelerating seismicity
Seismic quiescence and accelerating seismic energy release are considered as possible spatio-temporal patterns of the
preparation process of the 6 September 2002 Palermo, Italy, earthquake (M 5.8). The detailed properties of the quiescence are
analyzed applying the RTL algorithm. The RTL algorithm is based on the analysis of the RTL prognostic parameter, which is
designed in such a way that it has a negative value if, in comparison with long-term background, there is a deficiency of events
in the time–space vicinity of the tested point. The RTL parameter increases if activation of seismicity takes place. The RTL
algorithm identified that a seismic quiescence started from the beginning of November 2001 and reached its minimum at the end
of May 2002. The Palermo 2002 earthquake occurred 2 months after the RTL parameter restored its long-term background
level. The application of a log-periodic time-to-failure model gives a ‘‘predicted’’ (in retrospect) magnitude M= 6.2 main shock
on 5 May 2002.Published(243-255)reserve
Correlation length as an indicator of critical point behavior prior to a large earthquake
A large earthquake preparation is often manifested in correlation of seismicity in an area whose characteristic dimension
greatly exceeds a dimension of source of main shock. Zfller et al. [G. Zfller, S. Hainzl, J. Kurths, Observation of growing
correlation length as an indicator for critical point behavior prior to large earthquakes, J. Geophys. Res. 106 (2001) 2167–
2176] show the growth of correlation length of earthquakes prior to nine large earthquakes in California according to a power
low. We argue that the algorithm of correlation length estimation proposed by Zfller et al. [G. Zfller, S. Hainzl, J. Kurths,
Observation of growing correlation length as an indicator for critical point behavior prior to large earthquakes, J. Geophys.
Res. 106 (2001) 2167–2176] can result in a decrease of correlation length preceding its precursory growth before large
earthquakes if the area in which earthquake activity is correlated grows with time during a main shock preparation. The
correlation length analysis of acoustic emission events recorded in laboratory experiments on destruction of rocks and
correlation length analysis of intermediate magnitude earthquakes in the area of large earthquakes preparation on Kamchatka
and in Italy confirms the theoretical argument. This effect can be considered as an additional premonitory pattern of large
earthquake preparation