|
|
|
|
|
|
|
|
|
|
|
CONTENTS |
|
|
|
|
|
Introduction |
|
5.1. |
Zakynthos, Greece, 04/04/2006, Ms = 5.7 R |
|
5.2. |
East of Kythira, Greece, 08/01/2006, Ms = 6.9 R |
|
5.3. |
South of Creta, Greece, 24/11/2003, Ms = 5.1 R |
|
5.4. |
Lefkada, Greece, 14/8/2003, Ms = 6.4 R |
|
5.5. |
Skyros, Greece, 26/7/2001, Ms = 6.1 R |
|
|
|
|
|
 |
|
5. INTEGRATED EXAMPLES FROM REAL EQs.
Introduction
Some strong seismic events occurred in the Greek territory, during
the period 2003 - 2007 of the operation of the installed, monitoring
network, for the registration of the preseismic, electric signals.
These EQs provided the raw material to
test and validate the methodology, already presented. Depending on
the time span of the used data, one monitoring site was used (VOL),
two monitoring sites were used (ATH, PYR) and only once, just
recently after the installation of (HIO) monitoring site, three
monitoring sites (PYR, ATH, HIO) were used.
The examples to be presented refer to the following earthquakes:
Zakynthos, Greece, 04/04/2006, Ms = 5.7 R.
East of Kythira, Greece, 08/01/2006, Ms = 6.9 R.
South of Creta, Greece, 24/11/2003, Ms = 5.1 R.
Lefkada, Greece, 14/8/2003, Ms = 6.4 R.
Skyros, Greece, 26/7/2001, Ms = 6.1 R.
For each earthquake, the following parameters will be presented:
- Time of occurrence vs. daily, tidal, lithospheric oscillation.
- Time of occurrence vs. 14days period, tidal, lithospheric
oscillation.
- Calculation of the epicenter, based, on preseismic, electric
signals.
- Determination of magnitude.
- Accelerating deformation / quiescence, if any.
5.1. Zakynthos, Greece, 04/04/2006, Ms = 5.7 R.
Fig. 5.1.1.
Daily, tidal, lithospheric oscillation vs. time of
occurrence of the EQ in Zakynthos, Greece, 04/04/2006, Ms =
5.7 R.
Fig. 5.1.2. 14 days period, lithospheric oscillation vs. time of occurrence
of the EQ in Zakynthos, Greece, 04/04/2006, Ms = 5.7 R.
Fig. 5.1.3.
Epicenter areas (blue circles) determination by electric
precursory signals vs. to epicenter (red circle),
determined, by seismological methods for the EQ in Zakynthos,
Greece, 04/04/2006, Ms = 5.7 R.
Fig. 5.1.4.
Magnitude calculation, as M = 5.59 R, for the EQ in
Zakynthos, Greece, 04/04/2006, Ms = 5.7 R.
Fig. 5.1.5.
Increased accelerated, seismic energy release rate,
observed, prior to the EQ in Zakynthos, Greece, 04/04/2006,
Ms = 5.7 R.
5.2. East of Kythira, Greece, 08/01/2006, Ms = 6.9 R.
Fig. 5.2.1.
Daily, tidal, lithospheric oscillation vs. time of
occurrence of the EQ, East of Kythira, Greece, 08/01/2006,
Ms = 6.9 R.
Fig. 5.2.2. 14
days period, lithospheric oscillation vs. time of occurrence
of East of the EQ in Kythira, Greece, 08/01/2006, Ms = 6.9
R.
Fig. 5.2.3.
Epicenter area (blue circles) determination by electric
precursory signals vs. to epicenter (red circles),
determined, by seismological methods for the EQ, East of
Kythira, Greece, 08/01/2006, Ms = 6.9 R.
Fig. 5.2.4.
Magnitude calculation as M = 6.86R for the EQ, East of
Kythira, Greece, 08/01/2006, Ms = 6.9 R.
Fig. 5.2.5.
Increased, accelerated, seismic energy release rate,
observed, prior to the EQ, East of Kythira, Greece,
08/01/2006, Ms = 6.9 R.
5.3. South of Creta, Greece, 24/11/2003, Ms = 5.1 R.
Fig. 5.3.1.
Daily, tidal, lithospheric oscillation vs. time of
occurrence of the EQ, South of Creta, Greece,
24/11/2003, Ms = 5.1 R.
Fig. 5.3.2.
14 days period, lithospheric oscillation vs. time of
occurrence of the EQ, South of Creta, Greece,
24/11/2003, Ms = 5.1 R.
Fig. 5.3.3.
Epicenter area (red circle) determination by electric
precursory signals vs. to epicenter (green circles),
determined, by seismological methods for the EQ, South
of Creta, Greece, 24/11/2003, Ms = 5.1 R.
Fig. 5.3.4.
Cumulative, seismic energy release indicates that the
seismic area (EQ, South of Creta, Greece, 24/11/2003, Ms
= 5.1R) was at "lock" conditions and a magnitude M =
6.97R earthquake could occur due to the stored already
seismic energy.
Fig. 5.3.5.
No significant, seismic, energy release rate increase is
observed, since 1986 for the regional area South of
Creta, Greece, EQ, 24/11/2003, Ms = 5.1 R.
5.4. Lefkada, Greece, 14/8/2003, Ms = 6.4 R.
Fig. 5.4.1.
Daily, tidal, lithospheric oscillation vs. time of
occurrence of the EQ in Lefkada, Greece, 14/8/2003, Ms =
6.4 R.
Fig. 5.4.2.
14 days period, lithospheric, oscillation vs. time of
occurrence of the EQ in Lefkada, Greece, 14/8/2003, Ms =
6.4 R.
Fig. 5.4.3. Epicenter area
(blue circles) determination by electric, precursory
signals vs. to epicenter (red circles), determined, by
seismological methods for the EQ in Lefkada, Greece,
14/8/2003, Ms = 6.4 R.
Fig. 5.4.4.
Magnitude calculation as M = 6.54R for the EQ in Lefkada,
Greece, 14/8/2003, Ms = 6.4 R.
Fig. 5.4.5.
Seismic "quiescence" is observed for almost nine (9)
years before the EQ in Lefkada, Greece, 14/8/2003, Ms =
6.4 R.
Fig. 5.4.6.
De-accelerating, seismic energy release rate, observed,
for the EQ in Lefkada, Greece, 14/8/2003, Ms = 6.4 R.
5.5. Skyros, Greece, 26/7/2001, Ms = 6.1 R.
Fig. 5.5.1.
Daily, tidal, lithospheric oscillation vs. time of
occurrence of the EQ in Skyros, Greece, 26/7/2001, Ms =
6.1 R.
Fig. 5.5.2.
14 days period, lithospheric oscillation vs. time of
occurrence of the EQ in Skyros, Greece, 26/7/2001, Ms =
6.1 R.
Fig. 5.5.3.
Foreshock location (green circles, 21st July 2001, M =
5.1R) that preceded the main, seismic event of the EQ in
Skyros, Greece, 26/7/2001, Ms = 6.1 R.
Fig. 5.5.4.
Azimuthal direction of the Earth's electric field
intensity vector, determined, for VOL monitoring site,
in relation to the location of the EQ in Skyros, Greece,
26/7/2001, Ms = 6.1 R.
Fig. 5.5.5.
Magnitude determination for the EQ in Skyros, Greece,
26/7/2001, Ms = 6.1 R, when a longer “lock” period is
considered.
Fig. 5.5.6.
Magnitude determination for the EQ in Skyros, Greece,
26/7/2001, Ms = 6.1 R for the last “lock” period.
Fig. 5.5.7.
De-accelerating, seismic energy release rate (seismic
"quiescence"), observed, for about two years before the
occurrence of the EQ in Skyros, Greece, 26/7/2001, Ms =
6.1 R.
In all the presented examples, the cumulative, seismic energy
release was calculated by taking under consideration a seismogenic
area that is closely related to the major, lithospheric, tectonic
features which are present in the vicinity of the determined,
epicentral area. The latter is in compliance to the postulated "Lithospheric
Seismic Energy Flow Model", introduced, in section (2.5.1).
|
