A distributed-source approach to modelling the spatial distribution of MM intensities resulting from large crustal New Zealand earthquakes

Item

Title (Dublin Core)

en-US A distributed-source approach to modelling the spatial distribution of MM intensities resulting from large crustal New Zealand earthquakes

Description (Dublin Core)

en-US This paper presents a new approach to modelling the spatial distribution of intensities in crustal earthquakes, using a distributed source. The source is represented by one or two rectangular fault rupture planes of chosen dip, discretised into small rectangles each with its own share of the total seismic moment, and modelling chosen distributions of asperities. The Modified Mercalli (MM) intensity of shaking is represented by isoseismals. Comparisons are made with the actual isoseismals (particularly of intensities MM9 and MM10) of selected large historical crustal New Zealand earthquakes and those predicted by the simpler models of Dowrick & Rhoades (2005). Important differences and insights are found regarding near-source spatial distributions of ground shaking of shallow earthquakes with rupture length greater than about 28 km (Mw > 6.8) with any dip, and for Mw > c. 5.5 with dip < 60º. The influence of asperities relative to that of non-asperities is seen as modest near-fault increases in intensity. The new model can be applied to planar or biplanar fault ruptures of any length, width and dip. In the absence of isoseismal data on large earthquakes with normal focal mechanisms the current model is only verified for use on strike-slip and reverse events. A new concept, seismic-source intensity, is introduced and utilized.
The new model can also be applied to earthquakes in other regions of the world with adjustments for local attenuation rates as necessary.

Creator (Dublin Core)

Dowrick, D. J.

Rhoades, D. A.

Publisher (Dublin Core)

en-US New Zealand Society for Earthquake Engineering

Date (Dublin Core)

2010-06-30

Type (Dublin Core)

info:eu-repo/semantics/article

info:eu-repo/semantics/publishedVersion

en-US Article

Format (Dublin Core)

application/pdf

Identifier (Dublin Core)

https://bulletin.nzsee.org.nz/index.php/bnzsee/article/view/281

10.5459/bnzsee.43.2.85-109

Source (Dublin Core)

en-US Bulletin of the New Zealand Society for Earthquake Engineering; Vol 43 No 2 (2010); 85-109

2324-1543

1174-9857

Language (Dublin Core)

eng

Relation (Dublin Core)

https://bulletin.nzsee.org.nz/index.php/bnzsee/article/view/281/267

Rights (Dublin Core)

en-US https://creativecommons.org/licenses/by/4.0