Fig. 5From: Harmonic tremor from the deep part of Hakone volcanoSeismic activity beneath the Hakone volcano before and after the volcanic tremor. a Epicentral distribution of volcanic tremor and DLF earthquakes and b their depth distribution along with the N–S section. The black (or orange) open and red solid circles show the hypocenters of VT and DLF earthquakes, respectively. The orange circles denote the hypocenters of the earthquake swarm that occurred in May 2019. c The cumulative and the daily number of VT earthquakes, and d the cumulative number of DLF earthquakes. The two broken lines in d show the cumulative curves of DLF earthquakes at shallower and deeper depths than 25 km. e A magnified plot of the cumulative curve of DLF earthquakes during May 24–27, 2019. The vertical blue broken lines indicate the occurrence times of the volcanic tremors. The DLF earthquakes were detected by a matched filter method, whereas the VT earthquakes are based on the hypocenter catalog obtained by HSRI routine analysisBack to article page