After spending a few minutes reading through ASCE-7 (and what a garbled mess it is), it's still not clear what stresses would be used there. Section 2.4 does say not to use 1/3 increased stresses "unless it can be demonstrated that such an increas is justified by structural behavior caused by rate or duration of load". But then it also uses a 0.7 factor on seismic loads, so the loads themselves aren't really comparable either. 9.14.1.2 says "Where applicable strength and other design criteria are not contained in, or referenced by Section 9, such criteria shall be obtained from approved national standards", and those standards contain the 1/3 increase.
API and AWWA both give clear-cut methods to use for calculating seismic loads, whereas ASCE 7 drops the ball on the issue. Which is truly ironic, given that the entire purpose of the standard is to specify required loads.