Automatic Moment Tensor solution for SeisComP3
Transcript of Automatic Moment Tensor solution for SeisComP3
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Automatic Moment Tensor Automatic Moment Tensor solution for SeisComP3solution for SeisComP3
Second European Conference on Earthquake Engineering and Second European Conference on Earthquake Engineering and Seismology, Istanbul Aug. 25-29, 2014Seismology, Istanbul Aug. 25-29, 2014
Nikolaos TriantafyllisNikolaos Triantafyllis11, Efthimios Sokos, Efthimios Sokos22 and Aristidis Ilias and Aristidis Ilias11
1 University of Patras, Computer Engineering and Informatics Department, Rio 26504, Patras, Greece, 1 University of Patras, Computer Engineering and Informatics Department, Rio 26504, Patras, Greece,
[email protected]@ceid.upatras.gr, , [email protected]@ceid.upatras.gr
2 University of Patras, Geology Department, Rio 26504, Patras, Greece, 2 University of Patras, Geology Department, Rio 26504, Patras, Greece, [email protected]@upatras.gr
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IntroductionIntroduction
Moment Tensors are important for studies like Moment Tensors are important for studies like shakemap generation, tsunami warnings, shakemap generation, tsunami warnings, ground motion evaluation and moreground motion evaluation and more
Importance of automatic, quick and reliable Importance of automatic, quick and reliable Moment Tensor solutionMoment Tensor solution
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ScisolaScisola
Open-source python based softwareOpen-source python based software User friendly GUIUser friendly GUISupports:Supports: Automatic Moment Tensor calculation of events provided by Automatic Moment Tensor calculation of events provided by SeisComP3 in real-time SeisComP3 in real-time
Easy solution overviewEasy solution overview Quick solution revisionQuick solution revision Extensive configurationExtensive configuration
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SeisComP3SeisComP3
Likely the most widely distributed software package Likely the most widely distributed software package for seismological purposesfor seismological purposes
Evolved within approximately the last 10 yearsEvolved within approximately the last 10 years Its use ranges from pure acquisition or real-time data Its use ranges from pure acquisition or real-time data exchange over Internet to a fully featured real-time exchange over Internet to a fully featured real-time earthquake monitoringearthquake monitoring
Provides real-time waveform data through Seedlink Provides real-time waveform data through Seedlink protocolprotocol
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ISOLAISOLAISOLA moment tensor algorithm:ISOLA moment tensor algorithm: Point source iterative deconvolution methodPoint source iterative deconvolution method Full wavefield is taken into accountFull wavefield is taken into account Discrete wavenumber method for local or regional distancesDiscrete wavenumber method for local or regional distances Moment tensor is found by least-square minimization of misfit between Moment tensor is found by least-square minimization of misfit between
observed and synthetic waveformsobserved and synthetic waveforms Position and time of centroid is optimized through grid searchPosition and time of centroid is optimized through grid search
• Used in a manual way in GI-NOA, UPSL and other institutes worldwideUsed in a manual way in GI-NOA, UPSL and other institutes worldwide• More info in Sokos & Zahradnik, 2008 and Sokos & Zahradnik, 2013More info in Sokos & Zahradnik, 2008 and Sokos & Zahradnik, 2013
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ArchitectureArchitecture
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SeisComP3 InterconnectionSeisComP3 Interconnection
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Automatic ProcedureAutomatic Procedure
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Automatic ProcedureAutomatic Procedure
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Origin TriggeringOrigin Triggering Automatic ModeAutomatic Mode
Watch SeisComP3 through scevtlsWatch SeisComP3 through scevtls Retrieve origin's info through scxmldumpRetrieve origin's info through scxmldump
Manual ModeManual Mode Execution through python script (mostly for Execution through python script (mostly for
testing purposes)testing purposes)
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Automatic ProcedureAutomatic Procedure
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Station Selection based on DistanceStation Selection based on Distance Retrieves Stations/Streams Info from scisola databaseRetrieves Stations/Streams Info from scisola database Filters Stations/Streams by certain type Filters Stations/Streams by certain type
(e.g. HHN, HNE)(e.g. HHN, HNE) Removes Blacklisted Stations/Streams defined by the userRemoves Blacklisted Stations/Streams defined by the user Calculates distance and azimuth of stations according to Calculates distance and azimuth of stations according to
epicenterepicenter Selects Stations/Streams according to “distance rule”, Selects Stations/Streams according to “distance rule”,
defined by the user defined by the user (e.g. 3.5 (e.g. 3.5 ≤ mw ≤ 4.5 20 ≤ distance ≤ 100 km)→≤ mw ≤ 4.5 20 ≤ distance ≤ 100 km)→
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Automatic ProcedureAutomatic Procedure
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Bad Station Data FilteringBad Station Data Filtering
Filters unavailable stations/streams according Filters unavailable stations/streams according to seedlink to seedlink
Retrieves records from seedlink in mseed Retrieves records from seedlink in mseed format format
Filters stations/streams with gapsFilters stations/streams with gaps Filters stations/streams with clipping Filters stations/streams with clipping
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Automatic ProcedureAutomatic Procedure
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Station Data CorrectionStation Data Correction
Rotates stations/streams automaticallyRotates stations/streams automatically Corrects stations/streams dataCorrects stations/streams data
Removes instrumental effectRemoves instrumental effect Aligns according to origin timeAligns according to origin time Cuts to predefined durationCuts to predefined duration ResamplesResamples
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Automatic ProcedureAutomatic Procedure
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Station Selection based on AzimuthStation Selection based on Azimuth
Station distribution Station distribution according to epicenter according to epicenter location location
8 sectors, each of 458 sectors, each of 45°° Minimum number of Minimum number of
sectors defined by the user sectors defined by the user Maximum stations per Maximum stations per
sector defined by the user sector defined by the user
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Automatic ProcedureAutomatic Procedure
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Green's Functions ComputationGreen's Functions Computation
1D crustal model defined by the user1D crustal model defined by the user Computation of elementary seismograms (delta time Computation of elementary seismograms (delta time
function)function) Time window length of inversion procedure (tl) is defined by the Time window length of inversion procedure (tl) is defined by the
user according to “tl rule”user according to “tl rule”(e.g. 3.5 (e.g. 3.5 ≤ mw ≤ 4.5 tl = 327.68 sec)→≤ mw ≤ 4.5 tl = 327.68 sec)→
Centroid horizontal position fixed at epicenter location while Centroid horizontal position fixed at epicenter location while centroid depth is grid searchedcentroid depth is grid searched
The number of The number of trial sources above and below automatic trial sources above and below automatic depth estimation is defined by the userdepth estimation is defined by the user
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Automatic ProcedureAutomatic Procedure
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Inversion ComputationInversion Computation
Source inversion predefined to deviatoric typeSource inversion predefined to deviatoric type Inversion frequency band is defined by the Inversion frequency band is defined by the
user according to “frequency rule” user according to “frequency rule” (e.g. 3.5 (e.g. 3.5 ≤ mw ≤ 4.5 frequencies = [0.04, →≤ mw ≤ 4.5 frequencies = [0.04, →0.05, 0.08, 0.09] Hz)0.05, 0.08, 0.09] Hz)
Time grid search for centroid time is defined Time grid search for centroid time is defined by the userby the user
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Automatic ProcedureAutomatic Procedure
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Result PlottingResult Plotting
Generates text files with results and the final focal mechanismGenerates text files with results and the final focal mechanism Generates a map containing the epicenter location and Generates a map containing the epicenter location and
contributing stations' location contributing stations' location Generates a misfit of observed and synthetic waveforms plotGenerates a misfit of observed and synthetic waveforms plot Generates correlation plots containing focal mechanisms on Generates correlation plots containing focal mechanisms on
different depth and time and the best solutions for the different depth and time and the best solutions for the different depths different depths
Generates contributing streams plotGenerates contributing streams plot Saves results to scisola databaseSaves results to scisola database
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Revise ProcedureRevise Procedure
User can manually remove streams that have User can manually remove streams that have been selected by the automatic procedure from been selected by the automatic procedure from the inversionthe inversion
User can change inversion frequenciesUser can change inversion frequencies
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WatcherWatcher
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Automatic Vs ManualAutomatic Vs Manual
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Automatic Vs ManualAutomatic Vs Manual
Comparison of 46 manual MT Comparison of 46 manual MT solutions by GI-NOA, with 46 solutions by GI-NOA, with 46 automatic by scisolaautomatic by scisola
Comparison using the Kagan Comparison using the Kagan angle metricangle metric
Locations Locations red dots→ red dots→
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Automatic Vs ManualAutomatic Vs Manual
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Automatic Vs ManualAutomatic Vs Manual
34/46 = similar solutions≈ 74% success
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Automatic Vs ManualAutomatic Vs Manual
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Automatic Vs ManualAutomatic Vs Manual
39/46 = similar mw≈ 85% success
origins' difference not more than 0.3 of units
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Automatic Vs ManualAutomatic Vs Manual
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Automatic Vs ManualAutomatic Vs Manual
35/46 = similar c.depth≈ 76% success
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Automatic Vs ManualAutomatic Vs Manual
Results: Results: Automatic Vs Manual 74% similar solutionsAutomatic Vs Manual 74% similar solutions Automatic MTs recognize the size and depth of the seismic Automatic MTs recognize the size and depth of the seismic
source with adequate accuracy a few minutes after the event. source with adequate accuracy a few minutes after the event. Important for quick estimation of ground motions or tsunami Important for quick estimation of ground motions or tsunami hazardhazard
Average time of the automatic procedure is Average time of the automatic procedure is ≈ 5 minutes≈ 5 minutes
Quick revision, in just a few minutes, provides highly accurate Quick revision, in just a few minutes, provides highly accurate solutionssolutions
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Future ImprovementsFuture Improvements Advanced methods and artificial intelligence techniques for Advanced methods and artificial intelligence techniques for
stations/streams selectionstations/streams selection Implementation of multiple crustal models based on Implementation of multiple crustal models based on
earthquake’s locationearthquake’s location Advanced signal processing methods to be applied to seismic Advanced signal processing methods to be applied to seismic
waveforms (to avoid various problems e.g. disturbances, noise waveforms (to avoid various problems e.g. disturbances, noise and data transmission problems)and data transmission problems)
Search of centroid in 3D grid surrounding hypocenterSearch of centroid in 3D grid surrounding hypocenter Pre-calculated Green’s functions (for faster performance)Pre-calculated Green’s functions (for faster performance) Estimation of solution’s qualityEstimation of solution’s quality
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GUIGUI
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Log-in screenLog-in screen scisola DB (MySQL)scisola DB (MySQL)
SeisComP3 DB SeisComP3 DB (MySQL/PostgreSQL) (MySQL/PostgreSQL)
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Log-in screenLog-in screen scisola DB (MySQL)scisola DB (MySQL)
SeisComP3 DB SeisComP3 DB (MySQL/PostgreSQL) (MySQL/PostgreSQL)
databases
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Main ScreenMain Screen
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Main ScreenMain Screen
main tabs
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Main ScreenMain Screen
main buttons
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Main ScreenMain Screen
latest 20 origins
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Main ScreenMain Screen
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Main ButtonsMain Buttons
start/stop watcherstart/stop watcher settings screensettings screen search screensearch screen update latest 20 update latest 20
originsorigins about screenabout screen
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Main ButtonsMain Buttons
start/stop watcherstart/stop watcher settings screensettings screen search screensearch screen update latest 20 update latest 20
originsorigins about screenabout screen
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Settings ScreenSettings Screen
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Settings ScreenSettings Screen
settings tabs
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Settings ScreenSettings Screen
edit scisola stations
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Settings ScreenSettings Screen
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Settings ScreenSettings Screenclick to edit
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Main ScreenMain Screen
double click to review
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Review ScreenReview Screen
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Review ScreenReview Screen
review tabs
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Review ScreenReview Screenrevision
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Review ScreenReview Screenrevision
double click to remove stream
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Review ScreenReview Screen
delete origin
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Review ScreenReview Screen
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Review ScreenReview Screen
scroll to zoom in/out
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Main ButtonsMain Buttons
start/stop watcherstart/stop watcher settings screensettings screen search screensearch screen update latest 20 update latest 20
originsorigins about screenabout screen
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Search ScreenSearch Screen
shows origins in user shows origins in user defined datetime defined datetime (GMT) range(GMT) range
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Main ScreenMain Screen
searched origins
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Main ScreenMain Screen
clicking on minimizeclicking on minimize
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For More...For More...
source code and manual can be found here:source code and manual can be found here:https://github.com/nikosT/scisolahttps://github.com/nikosT/scisola