Welcome to This webpage serves as a pointer to the main URL's from where you can download SEISAN.


The next SEISAN workshop will be from May 21 to May 25, 2018. It will take place at Department of Earth Sciences, National Central University, Taoyuan, Taiwan.
The workshop is intended for existing SEISAN users, so there will not be training for new SEISAN users. Please send an email to Peter if you wish to participate, you must also provide a title for a small presentation (10-15 min) of your work. There will be room for up to 10 participants from outside Taiwan and 15 from Taiwan.
All participants will get a small data set, which include both tectonic and volcanic events that we would like you to start processing before arriving so we can get a flying start.
There will be a new version of SEISAN out (at April 1st) that we would like you to use.

The workshop will cover:

Analysis of events including volcano-tectonic events.

The intention is to go through the steps to completely process, particularly, small events whether from continuous data or event based data. The data will have tectonic and volcanic events so participant can concentrate on one or the other or both.

How can SEISAN work with continuous waveform data:
  • Detection of events with CONDET
  • Plotting of traces and extraction of events with MULPLT
  • Extraction of desired segments with WAVETOOL
  • Virtual networks

    What can SEISAN do for a volcano observatory:
  • Location
  • Magnitude
  • b-value
  • Fault plane solution
  • Plotting of hypocenters
  • Spectrogram
  • Spectral analysis
  • Particle motion
  • Automatic reprocessing
  • Classification and statistics

    An overview of automatic routines in SEISAN:
  • Phase picking
  • Magnitudes

    Work with participants own data, it is a workshop where everybody works.

    National Central University (NCU) is located in Zhongli District, Taoyuan City, Taiwan. There are some restaurants and convenient stores within or close to the NCU campus at walking distance. You can go ahead and book hotels in downtown Zhongli. Or we can reserve rooms for you at the NCU guest house, which is located at NCU compass. Due to limited rooms of the NCU guest house, please email Wei-Fang for details by April 30, 2018. Direction from Taiwan Taoyuan International Airport (TPE) to NCU: . NCU GPS location is 24.968N, 121.195E.

    Visa Information:
    Please check your own visa condition for visiting Taiwan at the website, for details. If you have further questions, please email Wei-Fang (

    Best regards,
    Hao, Peter, Lars and Jens

    The URL's are found here:
  • Download SEISAN latest version (and old versions): Software
  • Tutorial: PDF
  • Manual: HTML / PDF
  • Get help: Mailing List
  • Become an expert: Traning Document and Data : ZIP / RAR / TAR
  • SEISAN related software and data: Link

  • References: Havskov and Ottemoller, SeisAn Earthquake analysis software, Seis. Res. Lett., 70, 1999.

    Jens Havskov - Department of Earth Science, University of Bergen
    Lars Ottemöller - Department of Earth Science, University of Bergen
    Peter Voss - Geological Survey of Denmark and Greenland

    SEISAN presented at IRIS Webinar on OCT 6th, 2014 (Version 10.1, 1 hour 20 min):

    UIB Reports from networks using SEISAN and other nice informations: LINK