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VII International Workshop on Collapse Calderas

VII International Workshop on Collapse Calderas

VII International Workshop on Collapse Calderas

Toba Caldera, Sumatra, Indonesia

Workshop: 21st to 27th September, 2018

Workshop Outline

The workshop, like previous meetings, will be a venue to discuss many different aspects of calderas, their physical setting, associated magmatic processes, eruption dynamics, impacts of eruptions, hazards associated with caldera volcanism and their mitigation. Taking advantage of Toba’s unique record, resurgence will be a major theme. The workshop will consists of 3 full days of presentations and discussion, and 2.5 full days of field-based discussions.

The workshop will be held in charming Tuk Tuk on the eastern edge of Samosir island.Field trips will visit the key sites and outcrops of Samosir Island and Toba caldera. An optional visit to Sinabung Volcano Observatory is available to view the activity there. You will be able to enjoy the traditional Batak culture of Samosir.


The 7th Workshop on Collapse Calderas is scheduled for September 21st to 27th, 2018 at Tabo Cottages, Tuk Tuk, Samosir Island, Sumatra (


Participants will need to fly into Kualanamu International Airport (KNO), Medan. Many flights connect from Jakarta, Tokyo, and Singapore and other Asian hubs. We intend to arrange for pick up and transport from the Kualanamu International Airport.

Planned schedule

  • 20th – Arrive Medan, night in Medan
  • 21st – Transport to Tuk Tuk, via Simarjurunjung overlook, to TukTuk via Parapat, Dinner at Tabo
  • 22nd – Lectures and Discussion at Tabo, (Breakfast, Lunch, and Dinner @ Tabo)
  • 23rd – Lectures and Discussion at Tabo, (Breakfast, Lunch, and Dinner @ Tabo)
  • 24th – Field Trips (Early breakfast, packed lunch, dinner @ Tabo)
  • 25th – Field Trips (Early breakfast, packed lunch, dinner @ Tabo)
  • 26th – Lectures and Discussion at Tabo, (Breakfast, Lunch, and Dinner@ Tabo)
  • 27th – Return to Medan area via Prapat and Harangaol (Late flight out or night  at Airport Hotel (own expense))

Optional trip to active Sinabung volcano ($100 extra)

  • 27th – Night at Brestagi
  • 28th – Sinabung volcano, observatory, and field instruments. Night at Airport hotel (own cost) or late flight out.


Registration fee for the workshop

(The cost is expected to be $750 for full IAVCEI member registration; it will be given at the Second Circular)

The cost above includes registration for the 3-days of workshop, 2.5 days field trips, 7 nights accommodations on a twin room basis* (one night at the airport, 6 at the conference site), all meals (from the icebreaker dinner on the 20th night to the dinner on the 28th of September), and transporta1on to and from the Kualanamu airport, Medan.

*A single occupancy premium of $150 will be charged

We are planning to set a discounted registration $500 for Early Career folk that will be based on triple and quadruple occupancy. Please see the second circular for detail.

Organizers and Contact

General enquiries about the Workshop should be sent to the LOC at the following email addresses.

Shan de Silva (

Darren Gravley, Co-commissioner of CCC:

Please use “IAVCEI CCC 2018” in the subject line to ensure your emails are prioritized.

Important Dates

  • Second Circular open: April 2018
  • Registration open : May 1, 2018
  • Registration and Abstract submission deadline: June 15, 2018

Registration and Abstracts

Because of the limitation of the hotel and bus capacities, the maximum number of foreign participants will be ca. 50. Acceptance to attend the workshop will be prioritized based on previous attendance at commission workshops, courses and other commission activities.

An abstract style guide and detailed will be provided in the second circular.

What is the Commission on Collapse Calderas?

The IAVCEI Commission on Collapse Calderas (CCC) was created in March 2008 to have a wider and deeper understanding on calderas. The idea to file for a commission emerged in 2005, during a workshop on Caldera Volcanism, at which the Collapse Calderas Work Group was formed. The CCC includes a wide spectrum of disciplines, such as caldera geology, geophysics, mathematical and analogue modelling, subcaldera magma chamber processes, volcanic hazard and risk management, economic benefits and environmental research. Thus, it promotes interdisciplinary interaction to help solve the many questions regarding the formation of collapse calderas, theri evolution, and affect on society. Successfull workshops have been organized on a regular basis, and have been previously held at Tenerife, Canarias (2005), Mexican Vilcanic Belt (2008), Reunion Island (2010), Bolsena, Italy (2012), Taupo, New Zealand (2014), and Hokkaido, Japan (2016). 50 person attended to the 6th workshop in Hokkaido.

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