- Ground-motion model is: where Y is in cm∕s2, c1 = -1.2324, c2 = 0.5016, c3 = 0.0141, c4 = -0.0006, c5 = 0.9432, σe = 0.12
(inter-event), σr = 0.35 (intra-event) and σ = 0.37 (total) for near-trench events and c1 = -1.1321,
c2 = 0.8038, c3 = 0.0033, c4 = -0.0014, c5 = 1.3219, σe = 0.12 (inter-event), σr = 0.37 (intra-event) and
σ = 0.39 (total) for intraslab events.
- Only use data from rock sites (limestone, basalt, diorite and quartz monzonite).
- Focal depths: 6 ≤ H ≤ 20km for interface, 55 ≤ H ≤ 198km for intraslab.
- Uses data from high-frequency-depleted thrust near-trench events (interface) in central Mexico and
normal-faulting intraslab earthquakes in southern Mexico. Earthquakes in subduction zone between Cocos
and North American plate. Select near-trench events that have low ratios of energy to moment and large
disparity between Ms and Mw.
- Uses data from about 25 stations in central Mexico and about 15 in southern Mexico.
- Most data from r > 150km.
- Baseline correct and low-cut filter (0.05Hz for Mw > 6.5 and 0.1Hz otherwise) records.
- Tries various functional forms (e.g. quadratic magnitude term and magnitude-dependent saturation) and
choose form that leads to lowest σ.
- Examines residuals in four magnitude ranges w.r.t. distance. Fits lines and finds no significant trends.
- Notes that slightly higher σ may due to uncertainties in earthquake characteristics and simple functional
- Compares observations and predictions for Mw8 and Mw6.7 events w.r.t. distances. Finds good match
with most observations within ±1σ limits.