SEIS-UK - A New Centre for Seismic Equipment and Data Management in the UK
Paul Denton1 and
SEIS-UK (Seismic Equipment Infra-Structure in the U.K.) is a new
facility to assist academic geoscientists to acquire and manage
seismic data. SEIS-UK is funded by a Joint Infrastructure Fund (JIF)
grant won by a consortium of four UK universities (Leicester,
Cambridge, Royal Holloway College and Leeds). The facility provides
the field equipment, computers and software necessary for experiments
involving onshore recording of both controlled seismic sources and
earthquakes. The facility is housed at the University of Leicester.
1SEIS-UK, Department of
Geology, University of Leicester, Leicester, LE1 7RH. www.le.ac.uk/seis-uk/
SEIS-UK - P.K.H. Maguire, R.W. England, C.J. Ebinger,
C.M.R. Fowler, G.W. Stuart, R.S. White, K. Priestley (A Consortium
from the Universities of Leicester, Royal Holloway London, Leeds and Cambridge); Executive Manager: Paul Denton; Seismologist: Alex Brisbourne; IT: Andy Myers
A total of 30 broadband and around 150 short period systems will be
made available. Systems are being created to manage the total data
path, from recording data at a field site to producing a dataset
suitable for interpretation or archiving.
SEIS-UK can provide computers and software for use on field projects
which will enable the archiving of raw data onto tape in a rapid and
efficient manner. For controlled source seismic experiments, SEGY
record sections (either shot or receiver gathers) will be produced on
tape or disk ready for reading into standard processing packages such
as ProMAXTM. For natural source experiments (earthquake
recording) data will be archived in SEED format, separated into
"network day/week" volumes or "station month/year" volumes. These
SEED volumes will then be suitable for immediate use via existing
software routines or for permanent archiving.
It is the responsibility of the scientist running the experiment to
provide all personnel and logistical costs required for experiments.
The SEIS-UK team will only be able to provide assistance and training
in procedures for the operators. It is required that all scientists
provide a written report to the SEIS-UK committee on the scientific
outcome of experiments involving these systems, including all
publications arising from their use. Data must be released into the
public domain within 3 years of the end of data acquisition.
SEIS-UK can supply up to 30 Broadband Seismic Systems:
- 10 x 120s Guralp GMG-3TD sensors
- 20 x 30s Guralp CMG-40TD sensors
- with integral 24bit digitiser
- SAM data recorder with 9Gb SCSI disks
- Siemens SM36 solar panels
- GPS, cabling, spare disks, etc
Figure 1. An example of the Power Spectral Density of site noise
achieved with a Guralp 40TD compared to the new low- and high-noise
models. In this example, due to the site location characteristics,
simple burial of the sensor was selected as the most suitable
Pre-deployment training and advice can be provided regarding field
methods. In-field assistance is also available.
Figure 2. Guralp 40TD and 3TD instruments undergoing a Huddle Test
prior to the Cambridge University START experiment in the Tongariro
National Park, North Island, New Zealand.
Short period instrumentation will become available for
controlled-source and passive experiments towards the end of 2001.
SEIS-UK are in the process of acquiring around 150 x 1Hz sensors and
very low power data recorders. Available short period instrumentation
is currently undergoing evaluation by the consortium.
A complete data archiving facility is available in the UK
The facility also exists to produce archive-ready data sets in the
field during the experiment. However, this can be carried out most
easily at the data management centre in Leicester. For passive experiments,
- Sun Enterprise 220R rack mounted server with 2 processors and 2
- Sun T3 fibre-channel RAID disk array of 9 x 73 Gb disks.
- Sun DLT8000 and DAT DDS4 autochanger tape drives
SEIS-UK can provide full training in the use of PDCC software for the
production of the dataless seed volumes. SEIS-UK aim to have the
ability to maintain a permanent data archive through collaboration
with both ORFEUS and the IRIS DMC.
- PDCC software (IRIS) is used to produce dataless seed
volumes, used in conjunction with miniSEED data
- Full seed network-event volumes are derived from network-day
volumes using weed and rdseed (IRIS)
The facility is freely available to all interested parties. The
scope is not limited to data acquired using seismic equipment.
NEW ZEALAND - The Taupo Volcanic Zone is an excellent example
of the initial stages of back-arc spreading in continental
lithosphere. Data from broadband seismometers deployed across
the TVZ will be used to study the change in geometry and velocity
structure across the transition from near-zero to marked crustal
extension. Tomographic imaging will provide information on the local
crustal structure, and possibly allow imaging of pooled magma directly
beneath the volcanoes (R.S. White, University of Cambridge).
NORTH ATLANTIC - The Icelandic plume has played a major
role in the initial opening of the Atlantic; it is responsible for
the excess crustal thickness forming Iceland and the Greenland-Iceland-Faeroes ridge; and it affects the bathymetry over much of the NE
Atlantic. Surface waves for single and two-station paths across the NE
Atlantic will be recorded. These data will provide information on the
crust and upper-mantle S-wave structure of the plume, which is much
more sensitive to the thermal structure than is the P-wave velocity
structure (K. Priestley, University of Cambridge).
ETHIOPIA - Controlled source and passive seismic experiments
will be undertaken to image the crust and upper mantle just prior to
break-up in the northern Ethiopian Rift where the transition from
continental rifting to incipient spreading is captured. It is a region
where extensional velocities are low (4mm/yr), rift basins are
asymmetric and bounded by steep border faults, and en echelon
arrangement of the new magmatic segmentation shows little correlation
with the older border fault pattern (P. Maguire, Leicester; C. Ebinger, M. Fowler, Royal Holloway London; G. Stuart, J.-M. Kendall, Leeds).
Figure 3. Location of UK and proposed US (Stanford University and
the University of Texas, El Paso) normal incidence and wide angle
profiles, and UK passive arrays.
Once the system has been commissioned applications will be welcomed
from all interested academic groups to use the equipment and facilities.
schedule of SEIS-UK equipment use will be posted on the
SEIS-UK website and kept up to date.
- Once a time slot has been identified (in discussion with the
Executive Manager and the SEIS-UK Consortium) then a standard
Equipment Pool equipment loan form should be filled out,
identifying the equipment required as SEIS-UK items.
- These applications will then be reviewed under the existing NERC
GEP scientific review procedures before being passed on to
the SEIS-UK committee for scheduling.
- Existing NERC GEP procedures will then also be used for
monitoring equipment performance and publications.
Further information is available on the SEIS-UK website at
- Brisbourne A., Denton P., Maguire P.K.H. and SEIS-UK, 2001.
SEIS-UK - A new centre for seismic equipment and data management
in the UK. 26th EGS conference, Nice, France.
- Maguire P., Ebinger C., Fowler M., Stuart G., Kendall J-M. and
SEIS-UK, 2000. Array Design to Study Crust and Upper Mantle
Processes just Prior to Continental Break-up. AGU 2000 fall
meeting, San Francisco, USA.