Using the ground motion accompanying the unzipping of a dozen large quakes, a strong acceleration becomes evident about 10 seconds into the ruptures, according to Melgar and Hayes (2019), long before the halfway point of the rupture, when Meier et al. (2017) would call the magnitude.

Using the ground motion accompanying the unzipping of a dozen large quakes, a strong acceleration becomes evident about 10 seconds into the ruptures, according to Melgar and Hayes (2019), long before the halfway point of the rupture, when Meier et al. (2017) would call the magnitude.