The eruption frequency of geysers can be studied easily on the surface. However, details internal structure including possible water and gas filled chambers feeding eruptions driving mechanisms often remain elusive. We used a multidisciplinary network seismometers, video cameras, pressure sensors one tiltmeter to study eruptive cycle, structure, cycle Strokkur geyser in June 2018. An at always ...

Abstract We infer the temporal changes in pressure sources that induced crustal deformation during 2018 Shinmoe-dake eruption using strain and tilt observations discern deep magmatic activity associated with early stage of this began approximately 19 h earlier than previously defined onset activity. Distinct were observed from around 09:00 on 6 March to 12:00 8 (JST), coincident lava outflow in...

Abstract. The superconducting gravimeter (SG) GWR C025 has monitored the time variation in gravity at Conrad Observatory (Austria) since autumn 2007. Two tiltmeters have operated continuously spring 2016, namely a 5.5 m long interferometric water level tiltmeter and Lippmann-type 2D pendulum tilt sensor. co-located co-oriented set up enables wide range of investigations because tilts are sensit...

In September 2021, the La Fossa crater at Vulcano, in Italy, entered a new phase of unrest. We discuss set monitoring parameters included INGV surveillance network, which closely tracked sequence effects related to crisis. The low-frequency local seismicity sharply increased, while GPS and tiltmeter networks recorded inflation cone, as an effect fluid expansion hydrothermal system. Gravity vari...

Abstract From April to July 2021, West Crater at Iwo-Yama, Kirishima Volcanic Complex, Japan, was repeatedly filled with hydrothermal water and subsequently evacuated. The overall cycle lasted 14–70 h, the course of a single followed this sequence phases: (i) steam effusion disappeared 20–40 min before discharge; (ii) discharge occurred, generating pool; (iii) resumed gradually increased; (iv) ...

Abstract We estimate the mass and energy budgets for 2018 phreatic eruption of Mt. Motoshirane on Kusatsu–Shirane volcano, Japan, based data obtained from a network eight tiltmeters weather radar echoes. The tilt records can be explained by subvertical crack model. Small craters that were formed previous eruptions are aligned WNW–ESE, which is consistent with strike modeled in this study. direc...

We have developed a broadband ocean bottom seismometer (BBOBS) and its new generation (BBOBS-NX) with the penetrator sensor system since 1999. With them, we performed many practical observations to create research category of seismology. As next step in seafloor geophysical observation, BBOBS BBOBS-NX can be breakthrough realizing geodetic observation network on seafloor. Although vertical disp...

Abstract Semeru is the highest volcano on island of Java and one Indonesia’s volcanoes that has a potential threat pyroclastic flows. The eruption often shows transition pattern between explosive effusive styles. An increased eruptive activity occurred in 2021 with series explosions dominated first two thirds year then to flows December 2021. On 4 2021, dome collapse triggered significant reach...