lect 16 - 27 oct
TRANSCRIPT
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HHHorst Rademacher
Lect 15: EQ
Forecasting
Fall Semester
2015
27 Oct 15
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Class organization Extra Credit
Choose any topic related toEarthquakes and Seismology
Be Creative
It doesn’t have to be a written report
Add background stories, personal experiences,reflect on the issues
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Class organization Extra Credit
Seismicity reports:Cut and paste from
USGS and news websites
is not enough
cite all relevant sources
add your name and GSI on front page
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HHAnyquestions?
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Seismicity Report Areas with the
largest Seismic Hazards
Hindukush AfghanistanTajikistan
Kyrgyzstan
M=7.5
26 Oct 1509:09:33 UTC
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Felt from Tashkent
to Kolkata = 1700 mi
Seismicity Report Hindukush, M=7.5
26 Oct 15
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215 kmdeep
Seismicity Report
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Seismicity Report Hindukush, M=7.5
26 Oct 15, 215 km deep
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Seismicity Report Hindukush, M=7.5, 26 Oct 1
Recorded in Orinda
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Seismicity Report
Low pass filter
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Seismicity Report
High pass filter
Whatis this?
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Seismicity Report San Ramon, M=2.6,riding on the Hindukush waves
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Seismicity Report Two EQ superimposed
in one recording
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HHAnyquestions?
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Definition of EQ prediction:
To be useful , we have to pinpoint:
When
Where
How strong
These are scientifically
very stringent and challenging requirements
Recap from last lecture I:
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Why are we failing?
We need to have at least one
measureable precursor , whichconsistently occurs before each EQ
- Foreshocks, Seismic swarms- Change in velocity of seismic waves- Ground uplift- Radon Gas- Electrical conductivity- Animal behavior
Recap from last lecture II:
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Animal behavior
Circled number isthe number of
reported incidents
Recap from last lecture III:
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and then you wait………..
EQ Prediction was a failure!
28 Sep 2004
….but noprecursers
Recap from last lecture IV:
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HHAnyquestions?
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If EQ prediction is a failure,what can we do?
Prediction vs. Forecasting
Let’s lookelsewhere?
l d
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We can precisely predictthe phases of the moon
Prediction vs. Forecasting
Wi hi f
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Within a few cm, we canprecisely predict the tides
Prediction vs. Forecasting
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Falling objects in agravity field
G is the gravitational constant
6.674×10−11 N · (m/kg)2
Sir Isaac Newton, 1642-1726
Prediction vs. Forecasting
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Prediction vs. Forecasting
If we know the laws that govern a process,we can predict the outcome
This applies to all natural sciences:Physics, biology, chemistry, Earth science
So: Why can’t we predict EQ?
We don’t know all the laws
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Las Vegas gambling? very poor
Elections? in dictatorships: very goodin democracies: poor
Prediction
Stock Market? poor
How successful ispredictionelsewhere?
How long will a marriage last? poor
What about sports?
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Prediction
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Prediction
What about the weather?
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Not weather predictionbut weather forecast
Prediction vs. Forecasting
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Prediction Coin toss
Heads or Tails?
C i t
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PredictionCoin toss
Gaussian or Normal Distribution
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Prediction vs. Forecasting
If we know the laws that govern a process,we can predict the outcome
Prediction: Certainty
If we don’t know these laws,we can only forecast the outcome
Forecasting: ProbabilityOddsChances
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HHAnyquestions?
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Forecast Difference:prediction vs. forecast
Prediction:
To be useful, we have
to exactly pinpoint:
WhereWhenHow strong
No false alarms
No missed EQ
Forecast:
Probabilistic
assessment of EQoccurance
Time window,Only estimate oflocation andmagnitude
Thi d
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Reading:USGS fact Sheet 2015-3009 (2015)
A New Earthquake Forecast forCalifornia’s Complex Fault System
An update to:USGS fact Sheet 039-03 (2003)Understanding Earthquake Hazards in the SanFrancisco Bay Region
ForecastThis we can do…
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Statewide:
99% chance of M ≥ 6.7
San Francisco region:
63% chance of M ≥ 6.7
Los Angeles region:
67% chance of M ≥ 6.7
Forecast
www.wgcep.org/ucerf3
P t EQ id d
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ForecastPast EQ considered
in UCERF-3
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Forecast
Whi h f lt d ?
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ForecastWhich faults are ready?
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Forecast
San Francisco
vs.Los Angeles
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Forecast
Probability
for each faultin the Bay area
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HHAnyquestions?
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Thursday:
Guest Lecture:Prof. Charles Scawthorn, Kyoto, PEER:
Aftermaths of strong EQ
Homework #2
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X
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HHAnyquestions?
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