Recursive STA/LTA energy-window trigger ported from ObsPy signal/trigger.py recursive_sta_lta_py, LGPL-3.0. Copyright ObsPy Development Team. Full original module and license included, alongside complete editable JS adaptation. New flat-crust synthetic arrival/epicenter game, not a full layered-Earth travel-time solver.
Repository https://github.com/obspy/obspy
Commit 50033e1daf95233cd4f30e95a49c37fd50be2ccd
Complete editable adaptation: all local HTML/CSS/JS files. No build required.