Simultaneous ELF Magnetic Field Monitoring of Earthquakes ... Bleier.pdf · 17/3/2005 ·...
Transcript of Simultaneous ELF Magnetic Field Monitoring of Earthquakes ... Bleier.pdf · 17/3/2005 ·...
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SimultaneousELF Magnetic Field Monitoring
of Earthquakes from a Nano-Satellite (QuakeSat)
and a Ground Network
IWSE L3-3March 17, 2005
Tom Bleier (650) 473-9870 [email protected] Dunson (650) 814-4258 [email protected]
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Space and Ground Monitoring
Ground AC Magnetometer
Ionosphere
Magnetic Field Linesfrom
IGRF Model
Likely Signal Region at QuakeSat
Mean Orbital Altitude
Offset TargetLocation
QuakeSat OrbitalPath
Typical Target Offset1 to 10 deg Lat.
Epicenter*
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Ground Magnetometers
Commercial QF 1000 and 1003 SystemsHigh School System
0.3 to 4 Hz BW3pT noise floor20 Hz sample rate, raw data stored @ site300 sec RMS data displayed daily on web site
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Coverage Areawww.earthquaketracker.com
High School•3 axis mag.
QF-1003•3 axis mag.•GPS•GlobalStar•Air Conduct.•Geophone
QF-1000•3 axis mag.
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Satellite-Based Monitoring (QuakeSat)
• QuakeSat on orbit (June 30, 2003 to Dec 2004)– 840 km circular, sun synch orbit (dawn-dusk)– Single axis search coil magnetometer, small E-field dipole– 4 channels (one at a time)
• 1-10 Hz B• 10-150 Hz B (primary channel)• 130-150 Hz E and B • 10-1000 Hz B
– Sensitivity – noise floor • 5pT at 1000 Hz• 15 pT at 100 Hz• 30 pT at 10 Hz
– 2 ground stations• Stanford• Fairbanks Alaska• 9600 baud, half duplex
1.2m
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San SimeonELF Observations
Ground Monitors(Berkeley and QuakeFinder)
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ELF Monitor Site Locationswith Distances to San Simeon M6.5
44.3 mi
Permanent QF SitesBerkley (PKD) SiteTemporary QF Sites
M6.512/22/03
Quake too far away(57-97 km)
Oceanic Fault
San AndreasFault
64.4 km
57 km
71.3 km
65.8 km(noisy)
62.6 km
97.2 km(noisy)
37.3 km
10.3 km6km
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Enlargement: San Simeon M6.5 12/22/03
M6.5 quake
Ionospheric“pearls”?
SlightNoise
Increase
Schumannresonance
Data compliments of UC Berkeley Seismological Lab
10 Hz
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San SimeonELF Observations
QuakeSat
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San Simeon Earthquake -57 days
Power Frequency (10-150 Hz)
Frequency
Time (sec)
Time (sec)
Am
plitu
de d
b co
unts
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San Simeon Earthquake -56 days
Frequency
Time (sec)
Time (sec)
Am
plitu
de d
b co
unts
Power Frequency (10-150 Hz)
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San Simeon Earthquake +8 days
Power Frequency (10-150 Hz)
Frequency
Time (sec)
Time (sec)
Am
plitu
de d
b co
unts
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San Simeon Earthquake +21 days
Power Frequency (10-150 Hz)
Frequency
Time (sec)
Time (sec)
Am
plitu
de d
b co
unts
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Correlation between QuakeSat and Berkeley signals (San Simeon + 8 days)
Satellite trace and ground trace
QuakeSat data
Berkeley (ground) data
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Parkfield M6.0 Quake
9/28/04
10:15:24 PDT09:15:24 PST17:15:24 UTC
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Parkfield M6.0 and ELF sites
QF permanent sitesQF temp. sites
X Site temporarily down
Berkeley Site (PKD)
M6.0 Parkfield quake
20.9 km 16 km
76.7 km
39.7 km
17.7 km(noisy)
San Andreas Fault
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Berkeley Data (0-10 Hz) Day of quake Sept 28, 20004
“pearls”(IonosphericTones)
or man-made?
Strong ELF Burst
Data compliments of UC Berkeley Seismological Lab
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Berkeley Data Day of quake (Expanded to 0-1 Hz)
Strong ELF Burst
Data compliments of UC Berkeley Seismological Lab
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QF Parkfield station (day of quake)
ELF Burst
M6.0 quake
Calibration signal
After shocks
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Berkeley Data (0-10 Hz)Sept 1-30, 2004 Data compliments of UC Berkeley Seismological Lab
EMIC PC1 Pulsation
Unidentified Signal
ULF Bursts
Galactic X-Ray Burst
Sept 2004
Sept 2004
M6.0 quake
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
DataGap
Schumann Resonance
Schumann Resonance
Diurnal effects (typ.)IAR SRS
Broadband noise
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ULF Types
• Diurnal Effect– Increased activity due to daytime and solar excitation of
ionosphere.• Shumann Resonance
– Resonating cavity between ground and ionosphere.– Cpatures broadband EM impulses like lightning.
• ULF Waves– EMIC Waves (PC 1-2 pulsations)
• Electromagnetic ion cyclotron (EMIC) instability near the equator.• Pearls—structured PC1 waves.• IPDP Pulsations- Intervals of diminishing periods.
– Spectral Resonance Structures (SRS)• Likely caused by Ionospheric Alfven resonators.• Varies with time of day, season, and solar activity.• Harmonics up to second Schumann resonance.
• Broadband Noise– Often related to CME shocks hitting the Earth.– Galactic X-ray bursts
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Night ELF Bursts: Mar to Oct ‘04
04 05 06 07 08 09 10no data
no burst
small
medium
large
Months in 2004
Bur
st P
rese
nce
g p
Large Solar Storm Parkfield Quake Kp = 9.0 Kp = 2.0
Bur
st P
rese
nce
Small
Med
Large
No Burst
No DataMonths in 2004
Large Solar StormKp=9.0
Parkfield M6.0Kp=2.0
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Loma Prieta Vs Parkfield ULF Signals
ParkfieldM6 quake
July 23-28Solar Storms
1989 Loma Prieta Quake 20-60x normal
2004 Parkfield Quake 2-3xnormal
0.05-0.01 Hz
0.01-0.02 Hz(like Loma)
0.02-0.05 Hz
July 2004 Aug Sept
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Conductivity of Ground Attenuates Signal
MagnetotelluricStudy: ParkfieldSoil Resistivity
(Unsworth 2000)
1 Ohm per meterQF-1003
Berkeley PKD
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Summary – San Simeon quake
• Ground monitor data– May have been too far away to detect the San
Simeon signal (60 km Vs 15 km range est.)– Small number of “unusual signals, 3.2 Hz”
• QuakeSat data– ELF wideband noise (10-140 Hz) bursts seem
to appear near several quakes• Not confirmed yet-DEMETER data
– Some correlation with ground data (+8 day) • Need more samples
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Summary – Parkfield quake
• Ground monitor data:– Parkfield did not duplicate Loma Prieta
• No 20 X increase at 0.01 Hz (Brine layer near quake)– Strange ELF bursts prior to quake at 0.3 to 0.9
Hz (Ionospheric origin, but low solar activity?)– Strange ELF tones (pearls?) at 3.2 Hz
• Seen at PKD and QF Parkfield vertical channels only
• Satellite data:– QuakeSat and DEMETER: no valid data
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Backup Charts
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Direction of Arrival (Preliminary Results)Parkfield: Berkeley magnetometers, “Music” algorithm
SignalLocations:
Az. 41Elev. 68,78
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San Simeon Earthquake 12/22/03
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Propagation Modeling
Dr. Jacob BortnikUCLA Post Doc
Full Wave Model using Maxwell’s Equations
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Attenuation by Frequency (ELF-VLF) for Below Ground to Air
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Signal Refraction
Θc=0.01 deg.
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Ionospheric ELF/VLF Attenuation
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Status : First 17 mo. (9 mo. mission)
• 2000 + Worldwide Magnetometer Collections• Eliminated most internal noise sources
– Small boom with pico-tesla magnetometer– Reprogrammed on-board computer
• watchdog, beacon, software processes– Digital filtering on ground
• telemetry modem
• Detected natural signals– Whistlers (Lightning), Auroral Chorus,– 20+ signatures of unknown origin while targeting
active seismic zones
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QuakeSat Collection Geometry
Dec 30
Dec 24
Dec 14
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Did we see the same type of signal around other quake events?
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Major Earthquakes of Magnitude 6+
Dominican Rep EarthquakeSignal Date Days from EQ9/22/2003 EQ
10/22/2003 +31
Japan Earthquake (9/25/03)Signal Date Days from EQ9/25/2003 EQ10/6/2003 +9
New Zealand EarthquakeSignal Date Days from EQ11/2/2003 EQ12/24/2003 +5212/30/2003 +58
Xin, China EarthquakeSignal Date Days from EQ12/1/2003 EQ
12/11/2003 +1012/13/2003 +121/2/2004 +321/6/2004 +36
San Simeon EarthquakeSignal Date Days from EQ10/26/2003 -5610/27/2003 -5512/22/2003 EQ12/30/2003 +81/12/2004 +21
Iran EarthquakeSignal Date Days from EQ9/10/2003 -67
12/16/2003 -1012/26/2003 EQ1/19/2004 +24
Japan Earthquake (10/31/03)Signal Date Days from EQ10/22/2003 -910/23/2003 -810/23/2003 -810/31/2003 EQ11/18/2003 +1812/24/2003 +54
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Pattern Recognition (Dr. H. Kuzma-Berkeley)
Sat. CollectionSpectrogram
Raw Correlation:-Matched filter(0.2 sec by 10-80 Hz)
Refined Correlation:-Adjustable threshold (1 Sec, energy spread)
Manual Selection: -Accept/Reject
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World wide hits / false alarms
= Earthquake of magnitude 6+ within collection timeline (Sept ’03 to Feb ’04)= ELF Burst: at least one earthquake within 1000 km and +/-60 days of (hit)= ELF Burst: no earthquakes exist within 1000 km and +/-60 days (false alarm)
---- Satellite ground traces: no earthquakes within 1000 km and +/- 60 days---- Satellite ground traces: at least one quake within 1000 km and +/- 60 days
26 Green (hits)10 Red (false alarms?)
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How can one distinguishsignal originating from the ground
Vsnoise from the satellite or a signal
from space?
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Lightning Example SE USA
Impulsive signalspropagate throughionosphere in a dispersive manner
Higher frequenciesarrive sooner
Lower frequenciesArrive later
Is this an importantfeature for earthquakesignatures?
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Dec 30, 2003 10-150 Hz
2 important features
•Broadband energy•Dispersive (right tilt)
Noise from Battery Charging Circuit
Wideband ELF Bursts
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Signal Strength Variations
Why do some quakes have higher ULF/ELF signals?
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M 6.9-7.0Loma Prieta
M 6.0Parkfield
7 km16 km along fault
16.8 kmhypocenterdepth
7.9 km
Loma Prieta Vs San Simeon Vs Parkfield
M 6.5San Simeon
60 km perpendicular to fault
7.6 km
Factors Influencing Propagation and reception S/N:• Magnetic dipole moment (source signal strength)• Depth of hypocenter• Conductivity of rock structure• Frequency of signal (skin effect)• Distance of epicenter to sensor (coil)• Direction of sensor from epicenter (along fault?)• Sensitivity of sensor (instrument noise floor)• Ambient area (man-made noise)• Solar activity (noise)
Epicenter
Coillocation
Brine
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Satellite Coverage
Over Parkfield
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QuakeSat and DEMETER
QuakeSat: (green)• Power starved• Few collections• Bad geometry• No signals
DEMETER: (red)• Mag Torque coilsoperating over Parkfield area Parkfield