Query Regarding Stochastic Event-Based Hazard Model Results

[Ramesh Pudi]

Dear all,

I have computed a stochastic event-based hazard model and obtained results such as hazard maps for different return periods, as well as files for ground motion fields (GMF), events, and ruptures.

However, I've noticed that the event rate is not available in the GMF, rupture, or event data files. As a result, I am unsure how to derive return period-wise stochastic event footprints for both hazard assessment and potential losses. Could you please advise if there's something I may have overlooked in my calculations? Additionally, I would appreciate any guidance on the necessary steps to achieve this.

Thank you in advance for your assistance.

Best regards,

Ramesh

 

[Peter Pažák]

Hi, essentially you generate the events and hazard values for the effective time span e.g.:

There are 69_172 events and 41_469 ruptures in 20_000 years

(so 20k years) - then 1/20000 = 0.00005 is an event rate that can be used in the return period calculations.

Peter

Dátum: štvrtok 13. júna 2024, čas: 11:57:44 UTC+2, odosielateľ: pudira...@gmail.com

[Ramesh Pudi]

Dear Peter,

In another thread (https://groups.google.com/g/openquake-users/c/F1A0EP6cAJo/m/mSgqUtG3BAAJ), you provided code to obtain the occurrence rate from a .hdf5 file. I used this code to get the occurrence rate as well. However, the values I obtained are different from the one from 1/50,000 year.

Could you please clarify which value I should use for return period calculations?

Thank you for your assistance.

Best regards,

Ramesh