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Vertical movements of the Murono mud volcano in Japan caused by the Naganoken Kamishiro Fault Earthquake in 2014
© Kusumoto et al.; licensee Springer. 2015
Received: 25 December 2014
Accepted: 1 April 2015
Published: 17 April 2015
We observed vertical movements of the Murono mud volcano, Niigata, Japan, caused by the Naganoken Kamishiro Fault Earthquake (M = 6.7) on 22 November 2014. Precise levelling around the mud volcano was carried out on 27 November 2014, and the obtained elevation was compared with the data obtained for 11 November 2014. It was found that an elliptical uplift area, about 46 mm in magnitude and an order of magnitude smaller than that of the ones formed due to the past movements caused by the earthquakes in the same area, had been formed. It was considered that the structures of the shallow subsurface as well as the distance between the mud volcano and epicentre might play an important role in understanding the magnitude of vertical movements and distribution patterns.
Mud volcanoes develop at convergent plate margins and are usually located around the crests of anticlines in fold and thrust belts (e.g. Chigira and Tanaka 1997; Fowler et al. 2000; Bonini 2007; Morley 2007). They are useful indicators of stress orientation and tectonic controls (e.g. Bonini and Mazzarini 2010; Bonini 2012) and are a natural source of atmospheric methane that is a powerful greenhouse gas (e.g. Dimitrov 2003; Etiope and Milkov 2004; Etiope et al. 2008). Although most of them are normally in a dormant stage, their dormant stage activities are characterized by vigorous seepage of water, gas and petroleum, and many various observations have been carried out in order to elucidate their origins and/or processes (e.g. Deville and Guerlais 2009; Mazzini et al. 2009a; Rudolph and Manga 2010; Antonielli et al. 2014; Kusumoto et al. 2014).
The Murono mud volcano is located in the vicinity of an unnamed anticline limb near the Naradate syncline (Figure 1) (e.g. Noda 1962), in an area known as Niigata basin. The Niigata basin is characterized by many fold structures in the NE-SW direction and is one of the most important areas for oil production in Japan. In addition to these geological characteristics, it is known that the Murono mud volcano is located in a strain concentration belt (e.g. Sagiya et al. 2000). This strain concentration belt, called Niigata Kobe Tectonic Zone, has a strain rate of approximately 0.1 ppm/year, a value that is an order of magnitude larger than that of other areas of Japan (approximately 0.01 ppm/year); large earthquakes such as the 1995 Southern Hyogo Prefecture Earthquake (M = 7.3), the 2007 Niigataken Chuetsu-oki Earthquake (M = 6.8) and other earthquakes of M > 6 occurred in this strain concentration belt.
The Naganoken Kamishiro Fault Earthquake that occurred on 22 November 2014 was located in the strain concentration belt; the Kamishiro Fault is a part of the Itoigawa-Shizuoka Tectonic Line (e.g. Research Group for Active Faults 1991). Its magnitude (M) and hypocentre were 6.7 and at a depth of about 5 km, respectively (Japan Meteorological Agency 2014). The distance between the epicentre of this earthquake and the Murono mud volcano was about 76 km.
Given the past observational evidences mentioned above and due to a probability of occurrence of a similar type of movements as shown by Onishi et al. (2009) and/or Matta et al. (2012), we have carried out a periodic, precise levelling since 2012 to i) observe inter-seismic vertical movements as an indication of the status of the mud volcano at rest and ii) examine the source of any conspicuous vertical movements (Kusumoto et al. 2014). This year, we conducted the scheduled levelling in June and November. The last levelling was carried out on 11 November, and the Naganoken Kamishiro Fault Earthquake occurred 11 days later.
In this paper, we report vertical movements of the Murono mud volcano caused by the Naganoken Kamishiro Fault Earthquake, obtained by the precise levelling carried out on 27 November.
Observation and data processing
Each elevation was determined by geodetic net adjustment (e.g. Bonford 2012) referenced to the elevation of A0, the datum point which was determined by levelling from a second-order benchmark (BM2167-7) provided by the Geographical Survey Institute of Japan. The standard deviations of our levelling on 27 and 11 November 2014 were 0.08 and 0.10 mm, respectively.
The first uplift area is around the centre (A42 to A46); this uplift area is elliptical in shape with major and minor axes of about 80 and 40 m, respectively (estimations from a contour line of 15-mm uplift). The maximum magnitude of the uplift is 46 mm. The second one is located in the eastern part of the study area (A1 to A9), and the maximum magnitude of uplift is 32 mm. These uplift areas enclose a zone (A10 to A15 and A60) where, in contrast, a subsidence of less than about 5 mm was observed.
Earthquake data ( M ≥ 5.0) from 11 to 27 November 2014
Information regarding date, magnitude and hypocentre information for the earthquakes was retrieved from the web site of Japan Meteorological Agency (2014). The distances were calculated as horizontal surface distance between the epicentre of the earthquakes and the Murono mud volcano (37°7′16.41″N, 138°33′30.31″E).
Manga et al. (2009) proved a correlation between the magnitude and hypocentral distance of earthquakes and triggered mud volcano eruptions; in addition, Manga et al. (2009) showed that the triggerable condition of the mud volcano follows the empirical condition curve for the occurrence of liquefaction as in Wang et al. (2006). This curve indicates that an earthquake with high magnitude can activate a distant mud volcano; as an example, an earthquake of M = 5 can trigger a mud volcano at a distance of 20 km from its hypocentre, while an earthquake of M = 6 can trigger a mud volcano at a distance of 60 km from the hypocentre. Consequently, earthquakes of M = 5 class at more than 200 km distance from the Murono mud volcano could not have caused its eruption; therefore, we can conclude that the vertical movements of the ground shown in Figure 3 were caused by the Naganoken Kamishiro Fault Earthquake (M = 6.7) on 22 November 2014.
As mentioned above, the Murono mud volcano has experienced conspicuous uplifts due to three large earthquakes occurring in the neighbourhood since 2007 (including the one in this study); the Naganoken Kamishiro Fault Earthquake was almost the same in magnitude as the Niigataken Chuetsu-oki Earthquake and the Naganoken Hokubu Earthquake. However, the amount of vertical movement we observed was a tenth of the uplift observed after each of the past earthquakes.
The Murono mud volcano has a distance of about 49 km from the Niigata Chuetsu-oki Earthquake, about 16 km from the Naganoken Hokubu Earthquake, and about 76 km from the Naganoken Kamishiro Fault Earthquake. Although the Naganoken Kamishiro Fault Earthquake has the same magnitude as the Naganoken Hokubu Earthquake, there is a large difference (about five times) in the distance between the epicentre and the mud volcano. Therefore, we suggest that the distance between the mud volcano and epicentre (or hypocentre) would control the activation intensity or magnitude of eruption of the mud volcano.
In contrast, despite being located at a greater distance, the Niigataken Chuetsu-oki Earthquake caused the same vertical movements as the Naganoken Hokubu Earthquake in the mud volcano. Since the seaside area in the Niigata basin has a thick sedimentary layer, this might suggest that the geological setting and structure can affect vertical movements. In the future, it will be necessary to discuss subsurface structures when correlating the activity of mud volcano and earthquakes; in fact, the eruption of mud volcanoes can be triggered by seismic waves whose amplitude is affected by subsurface structures (e.g. Manga et al. 2009).
Conspicuous uplift around the central area corresponds to the past uplift due to neighbouring large earthquakes (e.g. Onishi et al. 2009; Matta et al. 2012) and has also been recognized as an uplift area during the quiescent phase (Kusumoto et al. 2014). Despite the small size of the mud volcano, it is interesting that the conspicuous uplift due to neighbouring large earthquakes occurred at the specific area and that the area undergoes an uplift during the quiescent phase; during this phase, a repetition of uplift and subsidence is observed within a period of around a month. A possible explanation of the recurrent uplift and subsidence each month in the quiescent phase can be the change in overpressure due to the flow of mud in the shallow layers (Kusumoto et al. 2014). From these observational evidences, we suggest that structures in the shallow subsurface would give some restrictions to the movement of the fluid mud, resulting in the uplift of the specific area. In order to clarify the origin of conspicuous uplifts due to neighbouring large earthquakes, it is necessary to estimate detailed, three-dimensional subsurface structures of this mud volcano in the future.
We carried out the precise levelling in the mud volcano on 27 November 2014 after the Naganoken Kamishiro Fault Earthquake of 22 November 2014 and compared the observed elevations with the precise levelling results on 11 November 2014.
We found that an elliptical uplift area of about 46 mm, corresponding to the uplift areas caused by the large, neighbouring earthquakes in the past, had been formed. Although it was clarified that the observed vertical movements were caused by the Naganoken Kamishiro Fault Earthquake, their magnitudes were an order of magnitude smaller than those of the vertical movements caused due to past earthquakes. Therefore, it was suggested that the distance between the mud volcano and epicentre (or hypocentre) of the earthquakes controls the activity of the mud volcano.
In addition, as an explanation of the conspicuous uplifts due to large, neighbouring earthquakes occurring in small specific areas, we suggested that structures of the shallow subsurface would control the formation and distribution of the uplift areas.
We are grateful to Waseda University for allowing access to the Murono car test track. We thank Keisuke Yachi, Masashi Watanabe and Hiroki Sugawara of the University of Toyama for their help in the levelling. Lastly, we are most grateful to two anonymous reviewers for their constructive reviews and comments on the manuscript and to Taku Ozawa for his editorial advice and cooperation.
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