The phrase "a dynamic trigger to" is correct and usable in written English.
It can be used when describing something that initiates or activates a change or response in a lively or adaptable manner.
Example: "The new marketing strategy serves as a dynamic trigger to engage our audience more effectively."
Alternatives: "an active catalyst for" or "a responsive prompt to".
Although their assumed geometry was different from the fault zones in Kumamoto and Oita, extended simulations would be helpful for understanding the cause of dynamic trigger in Oita area, where hydrothermal effects probably played an important role.
In the present case, the M7.3 Kumamoto earthquake has a potentially static or dynamic triggering effect (cf., Hill and Prejean 2015) to off-fault activities in the Aso and Oita regions.
A return to low seismicity levels 1 month after the triggered earthquake may have important implications for seismic hazard due to dynamic triggering.
It is known that some swarm activities start as a result of delayed dynamic triggering and other swam activities start from a dynamically triggered event by passing waves and persist for certain period (e.g., Hill et al. 1993).
A quick check shows that sites where dynamic triggering has been observed due to the 2016 Kumamoto earthquake were also activated immediately after the 2011 Tohoku-oki earthquake, for a relatively short time (Additional file 1: Figure S2).
The perspective of OA as a dynamic process triggered by diverse insults is increasingly accepted.
Note that we did not use seismic stations in Oita prefecture to avoid possible contamination by a dynamically triggered event discussed in "Dynamic triggering in Yufuin Beppu area" section.
Johnson, C. W., and R. Bürgmann (2016), Delayed dynamic triggering: Local seismicity leading up to three remote M≥6 aftershocks of the 11 April 2012 M8.6 Indian Ocean earthquake, J. Geophys.
The higher loss rate in the combined case is due to the dynamic triggering of the MAC layer adaptation.
The dynamic stresses in the areas where remote activation has been observed range from several kPa to tens of kPa, the thresholds being lower than in previous dynamic triggering cases for Japan; this might relate to a change in the crustal conditions following the 2011 M9.0 Tohoku-oki earthquake, in particular at volcanoes in NE Japan.
