In late 2001, 13 broadband recorders were deployed in Tasmania and four broadband recorders were deployed in southern Victoria (Figure 1). The majority of field effort in 2002 has been the deployment and servicing of 64 RSES short period seismometers in northern Tasmania (Figure 1). These stations were installed in March 2002 and removed, along with the broadband recorders, in August 2002. During their deployment, a total of six service trips (each eight days in duration) were undertaken by RSES personnel. This significant effort has been rewarded by the collection of a high quality dataset (see Figure 2 for an example), which should form the basis of a robust 3-D tomographic model of northern Tasmania's lithosphere.
Figure 1: Location of all broadband and short period stations which comprise the TIGGER experiment, along with Tasmanian Seismic Network (TSN) broadband stations. TIGGER broadband and short period stations are denoted by magenta triangles and red circles respectively. TSN broadband stations are denoted by blue diamonds.
The two principal targets of the TIGGER short period survey are the Arthur Lineament metamorphic complex and the Tamar Fracture System in the east; both features have been mapped at the surface but their structure at depth is poorly understood. Further information on the TIGGER project can be found at http://rses.anu.edu.au/seismology/tigger.
Figure 2: Arrivals from a magnitude 5.6 event in the Banda Sea region (6.47 S, 129 96 E) which occurred at 22.14 on the 19/3/2002. From top to bottom, the time series correspond to the recordings along the northern-most line of short period stations from east to west.
Comments on the maintenance of these frames to Ray Martin:
ray@rses.anu.edu.au