1 yr since the M6.4 Indios Puerto Rico earthquake.
The largest peak ground accelerations (PGA) were not registered at the closest stations (eg. PN12) but in Utuado, likely a combination of site/topographic effects.
Site effects were also noticed from the free field station (alluvium) at the PR2 bridge (Mayaguez Viaducto) causing important damage to the older side of the bridge.
The earthquake sequence is still active.
Data: #PRSMP #UPRM #redsismica #USGS