1. SEISAN Earthquake Analysis Software
Lars Ottemöller and Jens Havskov (University of Bergen)
Peter Voss (GEUS)

2. Background Development started in the late 80s
Large number of software contributors
Steady improvements, now Version 9.1
Basics unchanged
Supported operating systems: Solaris, Windows, Linux and MacOS

3. Who uses SEISAN
Geographically widely used (Norway, UK, France, Spain, ..., India, Iran, Philippines, ..., Central and South America, South and East Africa, ...)
15% of data sent to ISC in SEISAN format
National and regional seismic networks
Volcano observatories
Researchers

4. What can you do with SEISAN
Import/Export data
Store data (waveform and parametric)
Observatory routine:
Analyse earthquake data (signal processing, phase identification, ...)
Compute earthquake parameters (location, magnitude, ...)
Fault plane solution
Seismicity maps
Produce bulletin and catalogue search
Research platform, several additional data processing tools

5. Philosophy Open source Open system Non-commercial Multi-platform
Integrate essential tools and data storage into one package
Provide documentation
Provide support
Provide training

6. SEISAN Help
Manual (PDF and HTML)
Training document
Seisan Webpage
Mailing list:
Authors:

7. Other software SAC (http://www.iris.edu/manuals/sac/index.htm)
Geotool (CTBTO)
Seismic Handler (
Giant/Pitsa ( …
Link on Orefus and IRIS

8. Data Types
Waveform data
Calibration data
Parametric data

9. Waveform data
Created by digitising analogue output from seismometer and time stamping
Consists of amplitude and time
Translates into ground motion using instrument response information
Written out by data acquisition system
Waveform formats understood directly by SEISAN: SEISAN, SEED, miniSEED, SAC, GSE

10. Waveform data files Single or multiple channels
Data identifier: Station code, Channel code, Network code, Location code
Timing information
Data values
Used for: Recording, analysis, archival, data exchange, …

11. Waveform data into SEISAN
Conversion of data created by data logger
Conversion of data provided by another agency (IRIS, ORFEUS, ...)
Data written out by near real-time processing system (Earthworm, Seislog, SeisComP, ...)
Automated data collection: SEISNET

12. Waveform Conversion Examples
Rdseed: SEED -> miniSEED SEED -> SAC …
Wavetool: (mini)SEED <-> SEISAN SAC <-> SEISAN GSE <-> SEISAN …

13. Parametric data Derived from waveform data Observations: Computed:
Arrival times and residuals
Amplitudes
Polarities
Computed:
Hypocenter location
Magnitudes
Fault plane solution

14. SEISAN Directory Structure
C:\seismo
SEISAN-TOP
REA
WAV
CAL
DAT
INF
WOR
TEST
BER
BER
Workspace
Response Files
Documentation
Parameter Files
2005
2006
2005 01 02 03
... 01 02 03
...
Parametric files
Waveform files

15. Main SEISAN programs EEV: Database tool MULPLT: Seismogram analysis
HYPOCENTER: Location of local, regional and teleseismic earthquakes
EPIMAP: Seismicity maps
FOCMEC: Fault plane solution
SELECT: Extract parametric data

16. EEV

17. Main SEISAN programs EEV: Database tool MULPLT: Seismogram analysis
HYPOCENTER: Location of local, regional and teleseismic earthquakes
EPIMAP: Seismicity maps
FOCMEC: Fault plane solution
SELECT: Extract parametric data

18. MULPLT

19. MULPLT

20. MULPLT

21. Main SEISAN programs EEV: Database tool MULPLT: Seismogram analysis
HYPOCENTER: Location of local, regional and teleseismic earthquakes
EPIMAP: Seismicity maps
FOCMEC: Fault plane solution
SELECT: Extract parametric data

22. HYPOCENTER MAGNITUDES
All main magnitude scales can be used:
Local magnitude Ml
Coda magnitude Mc
Body wave magnitide mb, mB
Surface wave magnitude Ms, MS
Moment magnitude Mw

23. HYPOCENTER

24. Main SEISAN programs EEV: Database tool MULPLT: Seismogram analysis
HYPOCENTER: Location of local, regional and teleseismic earthquakes
EPIMAP: Seismicity maps
FOCMEC: Fault plane solution
SELECT: Extract parametric data

25. EPIMAP

26. Main SEISAN programs EEV: Database tool MULPLT: Seismogram analysis
HYPOCENTER: Location of local, regional and teleseismic earthquakes
EPIMAP: Seismicity maps
FOCMEC: Fault plane solution
SELECT: Extract parametric data

27. FOCMEC

28. Main SEISAN programs EEV: Database tool MULPLT: Seismogram analysis
HYPOCENTER: Location of local, regional and teleseismic earthquakes
EPIMAP: Seismicity maps
FOCMEC: Fault plane solution
SELECT: Extract parametric data

29. SELECT

31. Format Examples GSE Waveform
DATA_TYPE WAVEFORM GSE2.0
WID2 2007/06/04 17:34: ESK HHZ INT E
STA
DAT2
-986
-988
-990
-987
-992
-984
-982
...

32. Format Examples GSE Calibration
DATA_TYPE RESPONSE GSE2.0
CAL2 ESK HHZ CMG E /06/01 16:00
PAZ2 1 V E Laplace transform
E E+00
E E+00
E E+00
E E+00
DIG E Reftek

33. Format Examples GSE Phases
EVENT
Date Time Latitude Longitude Depth Ndef Nsta Gap Mag1 N Mag2 N Mag3 N Author ID
rms OT_Error Smajor Sminor Az Err mdist Mdist Err Err Err Quality
2007/04/28 07:18: ML
m i se
Sta Dist EvAz Phase Date Time TRes Azim AzRes Slow SRes Def SNR Amp Per Mag1 Mag2 Arr ID
TFO m P /04/28 07:18: T
TFO m S /04/28 07:18: T
MENF m P /04/28 07:18: T
MENF m S /04/28 07:18: T
APA mc P /04/28 07:18: T
SKP m P /04/28 07:18: T

34. Format Examples SEISAN Waveform
CWF HH Z CWF HH N CWF HH E
EDI HH Z EDI HH N EDI HH E
GAL1HH Z GAL1HH N GAL1HH E
HPK HH Z HPK HH N HPK HH E
KPL HH Z KPL HH N KPL HH E
LRW HH Z LRW HH N LRW HH E
PGB1HH Z PGB1HH N PGB1HH E
CWF HH Z …

35. Format Examples SEISAN Calibration
ESK S Z
A/D2048c/V RMY 13/02/97 E
.140E E E E

36. Format Examples SEISAN Phases
L BGS LBGS
GAP= E E E+02E
XNEAR XFAR SDEP
S.MOQ___
S.KYL___
ACTION:REE :53 OP:gdf STATUS: ID: I
STAT SP IPHASW D HRMM SECON CODA AMPLIT PERI AZIMU VELO SNR AR TRES W DIS CAZ7
KAR1 SZ EP
KPL HN ES
KPL HN AML
KPL HE AML
KAC SZ EP
EAB SZ EP
PGB1 HE ES
PGB1 HE AML
PGB1 HN AML
ELO SZ EP
EDI HE ES
EBH SZ EP
KPL HZ EP

37. SEISAN introductory training course
Demonstration
Installation
Seisan basics
Phase picking
Earthquake location
Magnitudes
Fault plane solution
Earthquake spectra
Participant’s data

38. Earthworm and SEISAN
Earthworm is a modular automated processing system
Functionality:
real-time data import/export
archive data
signal processing: decimate, filter, ...
helicorder and spectrogram plots
detect seismic events
locate and determine magnitude
Data output can be in SEISAN format

39. Waveform and parametric detection files
Earthworm
Data Acquisition
Association
Verification
Data Import
Picker
Location
WAVE- RING
PICK- RING
HYPO- RING
Shared Memory
Wave Server
Data Processing
Event Trigger
SEISAN format
Waveform and parametric detection files
Data Archival