Advanced Studies Institute on Earthquake Location

Bangkok, Thailand

2012-01-14 — 2012-01-17

Background Information

As part of its international development activities, IRIS International Development Seismology (IDS) is organizing a four-day Advanced Studies Institute focusing on Earthquake Location to be held in Bangkok, Thailand – January 14-17, 2012.

The meeting immediately follows the IRIS Metadata Workshop

Specific topic Earthquake Location: Recent Developments, Challenges and Opportunities and Double Difference Techniques for Earthquake Location

Multiple event relocation

This session will give an overview of multiple event location methods. It will introduce and apply the concept of double-difference and crosscorrelation methods for high-resolution seismic event location. The hypoDD algorithm will be used together with pre-prepared data sets that include network generated parametric data and high-precision delay-time measurements from similar seismograms to demonstrate relocation procedures and performance. Lecture material will include strategies for building differential-time networks, waveform cross-correlation, 1D and 3D velocity models for data prediction, regularization and data weighting, relative location error estimation, evaluation of solution robustness, and analysis of results. The lecture material will be illustrated with earthquake data from various tectonic settings. This section of the Institute will have a lab component where participants will work on selected data sets for software training and to acquire hands-on experience on the topics presented during the lecture. Participants with access to data are encouraged to bring their own data sets to the Institute in order to benefit from one-on-one instructor assistance. During the hands-on session, the pre-prepared or participant provided data set is used for software training

Real-time double-difference seismic monitoring

This session will introduce a new real-time procedure that employs double-difference and cross-correlation algorithms in a seismic monitoring context. Institute materials will include strategies for building a relational seismic data archive, procedures for large-scale earthquake catalog relocation, evaluation of real-time performance and location precision. This will be illustrated using an operational prototype system for high-precision relocation of earthquakes in Northern California using near-real-time seismic data feeds. Discussions and lecturer assistance will be aimed at evaluating the potential to implement these new techniques into the operational procedures of seismic networks in South East Asia.

Event locations and tomography

A final session will cover the fundamentals of 3D tomography and use of code for conventional 3D tomography (simul2000) and code for double-difference 3D tomography (tomoDD). During the hands-on session, a sample data set is used for software training. In addition, participants can bring their own data sets and obtain one-on-one assistance in analyzing it from the lecturer.


Individuals participating in the IRIS Metadata Workshop are invited to attend.

The IRIS DMS will arrange hotels room and air tickets. Participants will be asked to share a hotel room with one other participant. Upgrades to a single room are possible, but participants would be responsible for the cost difference.

Visas and entry requirements will need to be arranged by the participant.

Letters of Invitation will be sent by the Thai Meteorological Department.

Financial Support

There will be no registration fee to participate in this Advanced Studies Institute. Financial support is available from IRIS and will include hotel accommodation through January 16 (double occupancy) and cost of meals, for those participants attending the Metadata Workshop.

Location Details

Host: Thai Meteorological Department

Technical Requirements



IRIS DMS , National Science Foundation (NSF) and Thai Meterological Department .

Important Dates and Venue

2012-01-14 — 2012-01-17

Workshop will be held in Bangkok, Thailand.

Workshop Contacts

NSF SAGE Contact(s)

Local Contact(s)

  • No local contact defined.
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