The sequence
Newest first.
- 4.410 km SW of El Cerrito, Colombia141 km S of the mainshock1 week ago· 154.4 km deep
- 4.5Colombia79 km ENE of the mainshock2 weeks ago· 115.1 km deep
- 4.56 km WSW of Filadelfia, Colombia79 km ENE of the mainshock2 weeks ago· 115.1 km deep
- 4.420 km SW of Roncesvalles, Colombia124 km SSE of the mainshock2 weeks ago· 10.0 km deep
- 4.112 km S of Roncesvalles, Colombia128 km SSE of the mainshock2 weeks ago· 10.0 km deep
- 4.426 km SW of Sipí, Colombia80 km WSW of the mainshock3 weeks ago· 66.1 km deep
- 4.235 km W of Sipí, Colombia88 km WSW of the mainshock3 weeks ago· 66.7 km deep
- 4.413 km SSW of Roncesvalles, Colombia127 km SSE of the mainshock3 weeks ago· 10.0 km deep
- 4.328 km W of Chaparral, Colombia134 km SSE of the mainshock3 weeks ago· 10.0 km deep
- 4.622 km SW of Sipí, Colombia76 km WSW of the mainshock3 weeks ago· 71.3 km deep
- 4.223 km SW of Roncesvalles, Colombia123 km SSE of the mainshock4 weeks ago· 10.0 km deep
How the rupture zone is measured
An aftershock is a smaller earthquake triggered as the crust settles around the fault that ruptured. They cluster along that rupture, so the area worth searching scales with the size of the mainshock rather than being a fixed radius.
The 152 km zone above comes from the Wells & Coppersmith (1994) rupture-length relation, doubled because aftershocks routinely extend about one rupture length beyond each end of the fault, then floored at 50 km and capped at 400 km. Anything outside it is counted as separate regional seismicity, not part of this sequence.
Aftershocks are most frequent in the hours right after the mainshock and taper off over days to months. A quiet day does not mean the sequence has ended.
Data from USGS, EMSC and partner agencies. Magnitudes and locations are preliminary and may be revised.