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API 650 Seismic Zone for Indonesia

API 650 Seismic Zone for Indonesia

API 650 Seismic Zone for Indonesia

I have to design some tanks for a site in Indonesia. The site is in Seismic Zone 3 from the Indonesian code. What would be the corresponding Seismic Zone Factor for seismic design to Appendix E?

Indonesia is divided into several zones with basic seismic coefficients as follows, for firm ground
Zone 1 - C=0.09, highest lateral load
Zone 2 - C=0.07
Zone 3 - C=0.05
Zone 4 - C=0.03
Zone 5 - C=0.01, lowest lateral load

RE: API 650 Seismic Zone for Indonesia

Looks like no-one knows the answe to this one.

RE: API 650 Seismic Zone for Indonesia

Indonesia local code zone 4 is different from UBC Zone 3.
So far, I have no information on this matter.

RE: API 650 Seismic Zone for Indonesia

Dear sdz,
Trying to help you here.

AFAIK, Indonesia is divided to 6 seismic zone, which
very much different from API 650, from highest to lowest:
 Zone 1: basic seismic coeff. for firm ground = 0.13
 Zone 2: basic seismic coeff. for firm ground = 0.09
 Zone 3: basic seismic coeff. for firm ground = 0.07
 Zone 4: basic seismic coeff. for firm ground = 0.05
 Zone 5: basic seismic coeff. for firm ground = 0.03
 Zone 6: basic seismic coeff. for firm ground = nil

Most recent example, Nabire earthquake, is believed to be in Zone 1.

Hope this might help you.
Warm regars,

Ronald H. Harahap
PT Wijaya Pura

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