## 2 Region, Data, Method
### Stations Identification
#### 2.2.2 Volcanic Stations  
In the eastern part of the Kamchatka Peninsula there is an area of modern volcanism including active volcanoes. Broadband seismic stations are located in the vicinity of some volcanoes (Figure 2). During volcanic eruptions, volcanic and seismic signals can be recorded in seismic records at distances up to a few tens of kilometers from the centers of eruption [30; 31]. Data on volcano activity from the Institute of Volcanology and Seismology of the Russian Academy of Sciences and the Kamchatka Branch of the Geophysical Survey of the Russian Academy of Sciences ([[http://geoportal.kscnet.ru/volcanoes/](http://geoportal.kscnet.ru/volcanoes/)]([http://geoportal.kscnet.ru/volcanoes/](http://geoportal.kscnet.ru/volcanoes/)) (accessed on 31 December 2021); [[http://www.emsd.ru/~ssl/monitoring/main.htm](http://www.emsd.ru/~ssl/monitoring/main.htm)]([http://www.emsd.ru/~ssl/monitoring/main.htm](http://www.emsd.ru/~ssl/monitoring/main.htm)) (accessed on 31 December 2021)) were used when identifying a group of volcanic stations (Table 1).  
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Seismic** & **Station** & \multicolumn{4}{c}{**Coordinates**} & \multicolumn{2}{c}{**Frequency Range/**} & \\
**Station** & **Code** & **N**\({}^{*}\) & **E**\({}^{*}\) & **h asl, m** & **Equipment** & **Registration** & **Belonging to Dedicated Groups of Stations** \\ \hline Krutboeregovov & KBG & 56.258 & 162.713 & 30 & CMG-3 TB & 0.0083-40/100 & central & coastal & non-volcanic \\ \hline Ossora & OGS & 59.262 & 163.072 & 35 & CMG-6 TD & 0.033-40/100 & northern & coastal & non-volcanic \\ \hline Palana & PAL & 59.094 & 159.968 & 70 & STS-2 & 0.0083-40/100 & northern & coastal & non-volcanic \\ \hline Pauzheleka & PAU & 51.468 & 156.815 & 130 & CMG-6 TD & 0.033-40/100 & southern & continental & non-volcanic \\ \hline Petropavlovski & PET & 53.023 & 158.650 & 100 & STS-1 & 0.0027-10/20 & southern & coastal & non-volcanic \\ \hline Severo- & SKR & 50.670 & 156.116 & 30 & CMG-3 TB & 0.0083-40/100 & southern & coastal & volcanic \\ \hline Tiglil & TIGL & 57.765 & 158.671 & 115 & CMG-6 TD & 0.033-40/100 & northern & continental & non-volcanic \\ \hline Tilchüki & TL1 & 60.446 & 166.145 & 25 & CMG-3 TB & 0.0083-40/100 & northern & coastal & non-volcanic \\ \hline Tumok & TUMD & 55.203 & 160.399 & 478 & CMG-6 TD & 0.033-40/100 & central & continental & volcanic \\ \hline Khodutka & KDT & 51.809 & 158.077 & 22 & CMG-6 TD & 0.033-40/100 & southern & coastal & non-volcanic \\ \hline Shipunskiy & SPN & 55.106 & 160.011 & 95 & CMG-6 TD & 0.033-40/100 & southern & coastal & non-volcanic \\ \hline Eso & ESO & 55.932 & 158.695 & 490 & CMG-6 TD & 0.033-40/100 & central & continental & non-volcanic \\ \hline \hline \end{tabular}
\end{table}
Table 1: Cont.  
In 2011-2021 the Sheveluch, Klyuchevskoy, Bezymyanny, Plosky Tolbachik, Kizimen, Avachinsky, and Ebeko volcanoes were in the stages of eruptions and increased fumarole and seismic activity (Figure 2). The high activity of northern volcanoes Sheveluch, Klyuchevsky, Bezymyanny, Plosky, and Tolbachik was manifested in the records at seismic stations KIR, KLY, KOZ, and at TUMD station during the Kizimen volcano activation in 2011-2013. Weak signals from gas-ash emissions appeared in the records at SKR station during the Ebeko volcano eruption in 2016-2021 [32; 33; 34]. Brief episodes of increased activity from the Avachinsky volcano appeared in records at AVH station.