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Strain monitoring of hard rock mine slopes
Published in Vladimir Litvinenko, EUROCK2018: Geomechanics and Geodynamics of Rock Masses, 2018
Iuliia Fedotova, Eduard Kasparian, Ivan Rozanov, Mikhail Kuznetsov, Roman Dostovalov, Roman Dostovalov
This paper is mainly focused at a question how to organize a regional monitoring using both traditional and space geodetic methods under conditions of open mining in hard rock hierarchical-blocked deposits. According to experience, space geodesy methods have certain advantages in comparison with traditional geodetic methods in determining the spatial location of reference points, because they are highly productive, have principal capabilities of distant and automatic obtaining data; do not require a direct visibility between controlled points; can be used without restrictions in time and seasons and provide for a simultaneous capture of all three coordinates of the measured displacements.
Strain monitoring of hard rock mine slopes
Published in Vladimir Litvinenko, EUROCK2018: Geomechanics and Geodynamics of Rock Masses, 2018
Iuliia Fedotova, Eduard Kasparian, Ivan Rozanov, Mikhail Kuznetsov, Roman Dostovalov, Roman Dostovalov
This paper is mainly focused at a question how to organize a regional monitoring using both traditional and space geodetic methods under conditions of open mining in hard rock hierarchical-blocked deposits. According to experience, space geodesy methods have certain advantages in comparison with traditional geodetic methods in determining the spatial location of reference points, because they are highly productive, have principal capabilities of distant and automatic obtaining data; do not require a direct visibility between controlled points; can be used without restrictions in time and seasons and provide for a simultaneous capture of all three coordinates of the measured displacements.
Mechanism for seismic supershear dynamic rupture based on in-situ stress: a case study of the Palu earthquake in 2018
Published in Geomatics, Natural Hazards and Risk, 2022
Kanghua Zhang, Yishuo Zhou, Yimin Liu, Pu Wang
On 28 September 2018 at 10:02 (UTC), the MW7.5 earthquake struck the Indonesian island of Sulawesi and triggered a tsunami in Palu Bay. This disaster caused the death of two thousand individuals and destroyed nearly seventy-thousand buildings. After the earthquake, a growing number of studies using synthetic aperture radar (SAR) or geodetic surveys have provided robust evidence of the severe damage caused by this event (Bao et al. 2019; Socquet et al. 2019). Dynamic models of supershear earthquakes show that the rupture velocity of this event significantly exceeded the S wave velocity of the region’s crust, and was the dominant cause for the event. The longer the duration of the supershear rupture, the larger is the number of disasters that can occur. The 1999 MW7.6 event in Izmit (Bouchon et al. 2001), the 2002 MW7.9 event in Alaska (Walker and Shearer 2009), and the 2010 Mw6.9 Yushu earthquake (Zhu and Yuan 2020) are examples of past supershear earthquakes. These earthquakes are mainly strike-slip, and the Palu earthquake belongs to this model of supershear earthquakes. However, according to the results of space geodesy research, both the significant supershear rupture and the largest surface deformation occurred in the Palu Bay area, located 80 km south of the epicentre, instead of the region at the onset of seismic rupture (Socquet et al. 2019). Thus, it is necessary to study the mechanism of the seismic dynamic rupture process of the Palu earthquake.
Analysis on the differences between EOP 08C04 and EOP 14C04 related to the Earth rotation characteristics
Published in Journal of Spatial Science, 2022
Zhangzhen Sun, Tianhe Xu, Shi'e Zhou, Nan Jiang, Chunhua Jiang, Yuguo Yang
It can be seen from Figure 4 that there is a clear jump trend from 2011 to 2015 on the PM y-component of the difference between EOP 14C04 and EOP 08C04. The most likely cause is the Fukushima Earthquake in Japan on 11 March 2011, and almost all the IGS stations in the Japanese region have obvious displacement with different degrees. Moreover, the trend of the deformation of the IGS station is very different from that before the Earthquake, which leads to the difference when solving the ERP and the ITRF, and generates the abnormal deviation. In order to confirm the above conclusion, PM components in EOP 14C04 and EOP 08C04 are compared with the PM component provided by ITRF2014. The ITRF2014 PM series only contains data before 2015, which is because the deadline for those space geodesy solutions submitted to the ITRF2014 is 2015. Figure 6 shows the ERP differences of EOP 14C04 and EOP 08C04 compared to the ITRF2014 solution.
On the Lefkas (Ionian Sea) November 17, 2015 Mw=6.5 Earthquake Macroseismic Effects
Published in Journal of Earthquake Engineering, 2020
Ioannis Kassaras, Danai Kazantzidou-Firtinidou, Athanassios Ganas, Sandra Tonna, Antonios Pomonis, Christos Karakostas, Chara Papadatou-Giannopoulou, Dimitrios Psarris, Efthymios Lekkas, Konstantinos Makropoulos
Relatively high Arias intensity at VAS and intense displacement (~0.4 m) at the GNSS PONT advocate for extensive environmental effects observed along the western coast (Figure. 2). Structural damage mostly concentrated in the southwestern peninsula manifests spatial consistency with the results from InSAR interferometry [Melgar et al., 2017] (Fig 18a) and the environmental intensities [Fig 18b, Papathanassiou et al., 2017]. An additional source of damage is the shallow depth of the maximum slip, derived from the inversion of GNSS, InSAR and strong motion data, concentrated in the shallower part (< 5 km) of the southern patch of the causative fault (Fig 18c). The abovementioned highlight the effectivity of space geodesy as a damage monitoring system.