BODC Cruise Metadata Report for FS Sonne (06BE) cruise SO198-2

Introduction

This report collates information from the BODC cruise inventory and oceanographic databases. It presents

Cruise Inventory Information
A summary of BODC data holdings for the cruise from the
- National Oceanographic Database
- Projects Database
References - including cruise tracks and cruise reports

Cruise Inventory Information

Long name	FS Sonne (06BE) cruise SO198-2
Short name	SO198-2
Objectives and Narrative	All plate boundaries are divided into segments - pieces of fault that are distinct from one another, either separated by gaps or with different orientations. The maximum size of an earthquake on a fault system is controlled by the degree to which the propagating rupture can cross the boundaries between such segments. A large earthquake may rupture a whole segment of plate boundary, but a great earthquake usually ruptures more than one segment at once. The December 26th 2004 MW 9.3 earthquake and the March 28th 2005 MW 8.7 earthquake ruptured, respectively, 1200-1300 km and 300-400 km of the subduction boundary between the Indian-Australian plate and the Burman and Sumatra blocks. Rupture in the 2004 event started at the southern end of the fault segment, and propagated northwards. The observation that the slip did not propagate significantly southwards in December 2004, even though the magnitude of slip was high at the southern end of the rupture strongly suggests a barrier at that place. Maximum slip in the March 2005 earthquake occurred within ~100 km of the barrier between the 2004 and 2005 ruptures, confirming both the physical importance of the barrier, and the loading of the March 2005 rupture zone by the December 2004 earthquake. Cruise SO198-2, from Merak to Merak between 18th June and 30th July 2008 is the second of three cruises, funded by the Natural Environment Research Council (NERC), which will form a coherent set of geophysical observations in the source regions of the 2004 and 2005 great Sumatra earthquakes. This cruise collected seismic reflection (MCS) profiles at SB1 and SB2 with the following objectives: 1.To image the geometry and nature of the downgoing slab from the trench to 30-40 km depth within the forearc 2.To image faults within the over-riding plate responsible for the development of the accretionary wedge 3.To provide a set of shots that will calibrate the array of ocean-bottom seismome
Ship	FS Sonne
Departure Port	Cigading, Indonesia
Departure Date	2008-06-18
Arrival Port	Cigading, Indonesia
Arrival Date	2008-07-31
Principal Scientist(s)	Timothy J Henstock (University of Southampton School of Ocean and Earth Science)
Responsible Organisation	National Oceanography Centre, Southampton
Associated Project(s)	UK Sumatra Consortium
IHB Sea Areas Visited	Indian Ocean
Marsden Squares Visited	27/325/326
Work Area Description	Indian Ocean, west of Sumatra
Unable to lookup cruise bounds at this time
Work Area Bounding Polygon
Southern Limit	unknown
Northern Limit	unknown
Western Limit	unknown
Eastern Limit	unknown

Cruise Inventory Datasets

Physical oceanography
Bathythermograph	Quantity: number of profiles = 21 Description: Underway XBTs
Surface measurements underway (T,S)	Quantity: activity duration in days = 24 Description: Underway
Surface measurements underway (T,S)	Quantity: activity duration in days = 7 Description: Underway
Meteorology
Other meteorological measurements	Quantity: activity duration in days = 24 Description: Underway
Other meteorological measurements	Quantity: activity duration in days = 7 Description: Underway
Geology and geophysics
Gravity measurements	Quantity: activity duration in days = 7 Description: Lacoste and Romberg Seasys S40 run continuously in survey box
Gravity measurements	Quantity: activity duration in days = 24 Description: Lacoste and Romberg Seasys S40 run continuously in survey box
Magnetic measurements	Quantity: activity duration in days = 24 Description: Seaspy proton precession magnetometer
Magnetic measurements	Quantity: activity duration in days = 7 Description: Seaspy proton precession magnetometer
Multi-beam echosounding	Quantity: activity duration in days = 24 Description: Simrad EM120 run continuously in survey box
Multi-beam echosounding	Quantity: activity duration in days = 7 Description: Simrad EM120 run continuously in survey box
Multichannel seismic reflection	Quantity: track kilometres = 3350 Description: 5420 cu in source, 2.4km 12.5 group interval digital streamer
Multichannel seismic reflection	Quantity: track kilometres = 1500 Description: 5420 cu in source, 2.4km 12.5 group interval digital streamer
Single channel seismic reflection	Quantity: activity duration in days = 24 Description: Parasound (high-resolution profiler) run continuously in survey box
Single channel seismic reflection	Quantity: activity duration in days = 7 Description: Parasound (high-resolution profiler) run continuously in survey box