Charles University Prague partner no. 16 CUP

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Charles University Praguepartner no. 16 (CUP)

• J. Zahradník, J. Janský, V. Plicka

Acknowledgement Joint operation of BB stations
with UPatras. Phase data from CRL and waveforms
from NOA.
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Deliverable 12
Data base for selected stations of CUP (WP1)
Running at seis30.karlov.mff.cuni.cz
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Present status 6 CUP instruments jointly
operated with UPATRAS at 3 sites

• 2 stand-alone (SERG, MAMO)
• 1 satellite (LOUT)
• each one with CMG-3T and 5T (weak strong)

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Loutraki partof the new BB satellite
network Upatras ORFEUS !
Trillium and CMG
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Problems of the stand-alone stations (in red)
Common to 3T and 5T, caused by the recording
system, or simply the power brake.
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Problems of the stand-alone stations (in red)
Common to 3T and 5T, caused by the recording
system, or simply the power brake.
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Relative time shifts between 3T and 5T
indpendent GPS for 3T and 5T insufficient error
messages
Relative shifts had to be measured from the 3T
and 5T records.
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possible problem of digitizer or simply connector
of the GPS antenna
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possible problem of digitizer or simply connector
of the GPS antenna
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SER long-period disturbances due to a sudden
local tilt
They had to be removed by a special procedure.
M3.5 10-20 km
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D. Cervinkova, Bc Theses
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Deliverable 16
New software for source-parameter inversion
(WP1)

• moment-tensor inversion (weighted least squares)
• optimization of the source position and time
  (grid search)
• multiple point-sources (iterative deconvolution)

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ISOLA code (Fortran Matlab) multiple
point-source moment tensors
a user-friendly software
distributed through a web page
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Routine moment tensors for EMSC
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The main application in 3HAZUsing SER MAM
and 5 NOA stations for6 eventsM 4in the
Gulf2001-2005
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Studied events (Mw 3.4 to 4.7) status presented
at ESC, Sep 2006
Corinth Gulf
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Present status 3 solutions for each event
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Final (?) result consistency of waveforms,
polarity, location
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Final (?) result consistency of waveforms,
polarity, location
10 km
7 km
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10 km
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80 km
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20050529 an easy case , Mw4.7 depth 80 or 90 km
Optimum depth
Location depth
Foc. mech. is similar !
and the first-motion polarities are satisfied
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20050529 an easy case
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20021203 a difficult case, Mw3.4 depth 1 or
10 km ?
polarity OK
polarity not OK
Optimum Depth 1km
Location Depth 10 km
Foc. mech. is dissimilar !
polarities are satisfied at the location depth
for secondary correlation max. then foc. mech.
is similar to depth 1 km
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0.08-0.15 Hz final solution
Depth 10 km (consistent solution, but less good
waveform fit)
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0.15 - 0.20 Hz long wave trains
The trains do NOT imply the shallow depth. Even
the source depth of 1 km and low-velocity
layers do not explain them
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20021203 a difficult case depth 10 km rather
than 1 km

• Problematic seismic moment
• 1km 0.8e14 Nm
• 10km 1.4e14 Nm
• A further increase possible
• due to crustal model
• due to low frequencies

Location Depth 10 km
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20031118 Mw4.2, difficult broad-band clipped,
strong-motion OK
and the first-motion polarities are satisfied
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20031118 a difficult case
a very poor fit
and the first-motion polarities are satisfied
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20031118 Mw4.2, difficult (unstable when
varying parameters)
Shift?
Shift?
Shift?
and the first-motion polarities are satisfied
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20031118 (Mw4.2) vs. 20011224 (Mw4.2)wrong
good
Shift?
Shift?
Shift?
Timing problem is NOT due to crustal model !
and the first-motion polarities are satisfied
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20031118 further validation ?
S
P
SER at lt 20 km a near-field effect detected and
partially modeled (see the ramp between P and
S)
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20031118 a larger moment ? (a slow component
suggested by P. Bernard)
Moment 5-times larger (due to a slow
event) cannot be excluded !
Fast Mo1e15Nm, dur lt 0.5 sec Slow Mo4e15Nm,
dur 6 sec
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20031118 a larger moment ? (a slow component
suggested by P. Bernard)
Synth fast
Observed ( ? in statics)
Synth fastslow
Moment 5-times larger (due to a slow event) can
neither be excluded, nor confirmed !
Fast Mo1e15Nm, dur lt 0.5 sec Slow Mo4e15Nm,
dur 6 sec
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Outlook

• Routine moment tensors for the Corinth Gulf
  events in cooperation with the Patras BB
  satellite network
• Who needs the moment tensors ?
• Source complexity, simulation of strong-ground
  motions for future events in the region, ?

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Deliverable 95
New software for near-real time seismic alarms
(WP8)
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Turkey Flat, USA Site Effects Test Area Blind
Test of Predicted Ground Response of a Shallow
Stiff-Soil Site to the September 28, 2004 M6.0
Parkfield Earthquake

• Charles R. Real and Anthony F. Shakal
• California Geological Survey

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Sep. 28, 2004, Parkfield, M6fault and slip
after Ji, C. (Caltech)
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M6 Parkfield, 2004 strong-motion map reality
and our model
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Slip inversion a new task of CUP
(participation in the blind experiment of the
SPICE project)
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Solution with ISOLA software
Two slip patches
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Comparing inversion result with (confidential)
true slip distribuion
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Confidential input and 5 solutions
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3HAZ attracted students

• D. Cervinkova Bc Theses (removing
• long-period disturbances) defended
• P. Adamova MSc Theses (ISOLA software,
  applications) defended
• J. Burjanek PhD Theses (kinematic and dynamic
  source models) under preparation

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http//seis30.karlov.mff.cuni.cz