Long‐term lava extrusion after the 2011 Shinmoe‐dake eruption detected by DInSAR observations

Abstract

In January 2011, the latest eruption began at Shinmoe-dake volcano, Japan, and lava accumulated in the crater. Differential interferometric synthetic aperture radar (DInSAR) observations after the end of main eruption indicated continuous uplift on the lava surface. We estimated the volume increase of lava, and the volume change rate has decreased exponentially. Results from long-term DInSAR processing indicate slow subsidence outside the crater. We interpret that this subsidence is caused by deflation of a shallow source located beneath the crater, which is a reaction to the extrusion of lava. Between November 2011 and May 2013, the total volume of extruded lava within the crater is estimated to be 6.7 ± 0.1 × 10 4 m 3 , which is comparable to the deflation volume of the shallow source. The system is not closed within the shallow source to the crater; thus, long-term lava extrusion can be explained by continuous injection from a deeper source to the shallow source.

Imaging the Hydrothermal System of Kirishima Volcanic Complex With L‐Band InSAR Time Series

“…The inferred depth of 730 m is very similar to 2008-2010 (overlapping PDFs in Figure 3a). A similar source depth was also inferred for the Vulcanian stage of the 2011 magmatic eruption (Takeo et al, 2013) and for November 2011 to May 2013 magma extrusion period (Miyagi et al, 2014). These depths suggest that the deflation/inflation during the above four periods is from the same source.…”

“…(a) Marginal posterior density distributions of depths of pressure source beneath Shinmoe‐dake. From left to right: (1) deflation between the 2008 and 2010 phreatic eruptions, (2) inflation–deflation cycles during the Vulcanian stage in February 2011 (filled error bar; Takeo et al., 2013), (3) deflation during the 2011–2013 lava extrusion stage (empty error bar; Miyagi et al., 2014), and (4) inflation before the 2017 magmatic eruption. (b) Same as (a) but beneath Iwo‐yama for inflation before and after December 2017, respectively.…”

“…The deformation signals, synchronized with volcanic tremors or long‐period events, were attributed to the pressurization of a shallow conduit beneath the crater (Nakamichi et al., 2013; Takeo et al., 2013). Localized deflation and inflation patterns were also observed from November 2011 to May 2013 and prior to the 2017 magmatic eruption (Miyagi et al., 2014; Morishita & Kobayashi, 2018).…”

Precursory crater contraction associated with the 2017 eruption of Shinmoe-dake volcano (Japan) detected by PALSAR-2 and Sentinel-1 InSAR

“…The lava dome in ated from the termination of the 2011 eruption until the middle of 2016 (Miyagi et al 2014; National Research Institute for Earth Science and Disaster Resilience (NIED) 2017). Broad-scale in ations with 4 cm of line-of-sight (LOS) change and a spatial extent of 10 km located 5 km to the west-northwest from the crater preceding the 2011 eruption of Shinmoe-dake volcano (Miyagi et al 2014). Following the eruption in 2011, the broad deformation signal transitioned to de ations at a similar spatial extent.…”

An Investigation of Volcanic Ground Deformation Using InSAR Observations at Tendürek Volcano (Turkey)

“…Considering these advantages, StaMPS is frequently used for the long-term monitoring of ground deformations in volcanic areas where other PSI approaches are less successful. In previous studies, StaMPS has been applied worldwide for monitoring surface deformations caused by volcanoes, including the Alcedo volcano in Ecuador [33], Piton de la Fournaise in France [34], the Changbaishan Tianchi volcano in China [35], the Santorini volcano in Greece [36], the Shinmoe-dake volcano in Japan [37], the Medicine Lake volcano in the United States [38], and Mount Etna in Italy [39].…”