WP 5.3 Study of the strong ground motion, acceleration and intensities of the two large earthquakes

Start date or starting event:

M0

Lead contractor:

UI

Participants:

UI, IMOR

1

Objectives:

To study strong ground motion by applying recordings of the 2000 earthquakes, emphasizing attenuation and duration. Special attention will be given to the strong ground motion in the near source area.

2

Inputs: Main source of data:

Strong ground motion recordings from 32 ground response stations, thereof 17 in and near the SISZ of earthquakes in the area.

Additional data considered:

Seismometer data from more than 30 stations in all of Iceland. Replies to questionnaires about felt intensities in the 2000 earthquakes. Information on seismic and geological structure.

Methodology / work description:

Based on digital recordings from tri-axial accelerometers in earthquakes in South Iceland mathematical models are derived which describe the strong ground motion. These models are necessary for microzonation and for simulating realistic input records to computational structural models. The models account for the variability in the ground motion with respect to factors such as direction to fault, directivity and soil amplification. The mathematical models are based on an analytical approach in contrast to the empirical approach commonly applied.

3

Deliverables including cost of deliverable as percentage of total cost of the proposed project:

D83

Attenuation of strong ground motion of the large earth­quakes.

M12  Re  PU  1,2%

D84

Near source effects, duration of ground shaking and soil amplifications.

M18  Re  PU  2,0%

D85

A comprehensive reporting describing the strong motion data, the theoretical modelling, attenuation of strong ground motion and near source effects. 

M20  Re  PU  2,8%

                                                                                              

4

Milestones: Delivery of the above items at the date indicated.