Ascertain S-wave and rupture front arrival times at the CCTV site

Determine the exact absolute arrival times of the S-wave and the rupture front at the CCTV location (20.8821°N, 96.0353°E) during the 2025 Mandalay Earthquake despite the inaccurate video timestamp, to constrain the local rupture propagation speed and reconcile near-fault observations with inversion results.

Background

The CCTV site captures near-fault motion including an apparent S-wave arrival preceding the rupture front, which suggests subshear behavior locally. However, the video timestamp’s inaccuracy prevents the authors from assigning exact absolute times to these arrivals.

The exact arrival times are needed to unambiguously quantify local rupture velocity and to compare with inversions indicating supershear propagation near the hypocenter.