OpenQuake Fault Realization

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Nima Dolatabadi

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Jun 16, 2021, 12:24:01 AMJun 16
to OpenQuake Users
Hello all,
we know that sources can be defined in different formats, but as input they get a nodal plane as one for area source and two for Fault base Hazard assessment.
The input is "STRIKE, DIP, RAKE"
The Question is that how does openquake determine if a fault is Nomal, Reverse or Strike-Slip. I'm having a geological bakcground and know abaut focal mechanism but having a fault data like strike, dip, and rake is not enough to evaluate the Mechanism of a fault. Though two nodal plane without knowing the PTB axis which can define the compression and dilation area, is not enough for fault mechanism estimation.
1- Does openquake consider the fault type?
2- How does openquake consider Faulting Dip Direction? we know that Dipping has a direction, for example it is: 60 NE or simply 60E. so without considering the direction of dipping how does openquake defined the direction to calculates the Hazard Module.
Great Regards

Marco Pagani

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Jun 16, 2021, 5:04:56 AMJun 16
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The rupture mechanism (normal, reverse etc.) is defined using rake. The strike (and the dip) is defined using the right hand rule.
See OQ manual (page 29, 33)

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MARCO PAGANI | Seismic Hazard Team Lead | Skype mm.pagani | +39-0382-5169863
GLOBAL EARTHQUAKE MODEL | working together to assess risk
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