The relationship between stress changes and strong earthquakes since 1900 around the Bayan Har block in northern Tibet, China

2019 ◽  
Vol 184 ◽  
pp. 103974
Author(s):  
Pingen Li ◽  
Li Liao ◽  
Jianzhou Feng
Keyword(s):  
Strong Earthquakes ◽  
Northern Tibet ◽  
Stress Changes ◽  
The Relationship ◽  
Bayan Har

Middle and Late Triassic radiolarians from northern Tibet: Implications for the Bayan Har Basin evolution

Geobios ◽  
2009 ◽  
Vol 42 (5) ◽  
pp. 581-601 ◽  
Author(s):  
Qinglai Feng ◽  
Zijiang Yang ◽  
Xianyang Li ◽  
Sylvie Crasquin
Keyword(s):  
Late Triassic ◽  
Basin Evolution ◽  
Northern Tibet ◽  
Bayan Har

The relationship between the deep-level structure in crust and brewing of strong earthquakes in Xingtai area

1999 ◽  
Vol 12 (6) ◽  
pp. 647-658 ◽  
Author(s):  
Lan-Xi Xiao ◽  
Yuan-Qing Zhu ◽  
Shao-Quan Zhang ◽  
Xu Liu ◽  
Yu Guo
Keyword(s):  
Deep Level ◽  
Level Structure ◽  
Strong Earthquakes ◽  
The Relationship

scholarly journals Comparative Analysis on Seismicity and Stress Triggering of Strong Earthquakes Sequence in Central Tibet

2021 ◽  
Author(s):  
Gang Yang ◽  
Dongning Lei ◽  
Jianchao Wu
Keyword(s):  
Fault Zone ◽  
Seismic Activity ◽  
Relaxation Effect ◽  
Earth Model ◽  
Coulomb Stress ◽  
Maximum Magnitude ◽  
Strong Earthquakes ◽  
Coulomb Stress Changes ◽  
Stress Changes ◽  
Central Tibet

Abstract The Central Tibet constitutes part of the central part of Qinghai-Tibetan Plateau, which is one of the highest seismic activity areas in China. This paper discussed the regularity of seismic activity in this area. Based on a stratified viscoelastic earth model, we calculated the Coulomb stress changes imparted from the 4 strong earthquakes (M≥6.3) the Bengco - southeastern piedmont of Nyainqentanglha mountain fault zone in this region. The result shows that the study area may enter a new active period from 2020. There was a trigger between strong earthquakes (M≥6.3) on the Bengco fault - southeastern piedmont of Nyainqentanglha mountain fault zone. The post-seismic viscous relaxation effect of a strong earthquake had a significant impact on subsequent earthquakes(M≥6.3). In future 100 years, the Coulomb stress loading is more than 1.0 MPa in northwest section of Bengco fault and central of Nimu segment of southeastern piedmont of Nyainqentanglha mountain fault, thence strong earthquakes may occur in this two fault segments. The maximum magnitude of the earthquake will be M6.7 in the future 100 years.

scholarly journals Earthquake-triggered landslides in southwest China

2012 ◽  
Vol 12 (2) ◽  
pp. 351-363 ◽  
Author(s):  
X. L. Chen ◽  
Q. Zhou ◽  
H. Ran ◽  
R. Dong
Keyword(s):  
Southwest China ◽  
Earthquake Magnitude ◽  
The Tibetan Plateau ◽  
Study Region ◽  
Strong Earthquakes ◽  
Landslide Hazards ◽  
Geological Conditions ◽  
Southeastern Margin ◽  
Fault Belt ◽  
The Relationship

Abstract. Southwest China is located in the southeastern margin of the Tibetan Plateau and it is a region of high seismic activity. Historically, strong earthquakes that occurred here usually generated lots of landslides and brought destructive damages. This paper introduces several earthquake-triggered landslide events in this region and describes their characteristics. Also, the historical data of earthquakes with a magnitude of 7.0 or greater, having occurred in this region, is collected and the relationship between the affected area of landslides and earthquake magnitude is analysed. Based on the study, it can be concluded that strong earthquakes, steep topography as well as fragile geological environment, are the main reasons responsible for serious landslides in southwest China. At the same time, it is found that the relationship between the area affected by landslides and the earthquake magnitude in this region are consistent with what has been obtained worldwide. Moreover, in this paper, it is seen that the size of the areas affected by landslides change enormously even under the same earthquake magnitude in the study region. While at the same tectonic place or fault belt, areas affected by landslides presented similar outline and size. This means that local geological conditions and historical earthquake background have an important influence on landslides distribution, and they should be considered when assessing earthquake-triggered landslide hazards at Grade 1 according to ISSMGE.

The Mechanism of the Earth's Epidermis Warming Caused by Exploitation of Fossil Fuels

2014 ◽  
Vol 535 ◽  
pp. 460-463
Author(s):  
Dong Yin Han
Keyword(s):  
Thermal Stress ◽  
Continental Crust ◽  
Fossil Fuels ◽  
Oil And Gas ◽  
Strong Earthquakes ◽  
Mining Areas ◽  
The Past ◽  
The Relationship ◽  
Earth Interior ◽  
Tectonic Activities

The techniques are referred to as analyzing the relationship between the events of the lithosphere getting thermal and the changes of weakened release energies of strong earthquakes that might be related with the ones of increased exploitation quantities of the global three-large fossil fuels of coal,oil and gas ,and the relationship between the events of earth crust expansion getting thermal with the accumulated increasing of the land crust expansion thickness from calculation and the accumulated increasing of fossil fuels being exploited,et al. The three mechanism-modes of earth's epidermis warming over the past 100 years since 1890 from earth interior changes with relation to fossil fuels being exploited were suggested that the weakened release energies of global strong earthquakes caused by the increasing of earth thermal stress energies and overall warming of lithosphere, the “weightlessness” and expansion and getting thermal of continental crust,the increasing of earth currents and heat quantities generated by added origid geological and tectonic activities in mining areas and earth's surface getting thermal.

scholarly journals Locking Status and Earthquake Potential Hazard along the Middle-South Xianshuihe Fault

2018 ◽  
Vol 10 (12) ◽  
pp. 2048 ◽  
Author(s):  
Rumeng Guo ◽  
Yong Zheng ◽  
Wen Tian ◽  
Jianqiao Xu ◽  
Wenting Zhang
Keyword(s):  
Slip Rate ◽  
Relaxation Effect ◽  
Historical Earthquakes ◽  
Coulomb Stress ◽  
Deformation Model ◽  
Potential Hazard ◽  
Viscoelastic Deformation ◽  
Strong Earthquakes ◽  
Coulomb Stress Changes ◽  
Stress Changes

By combining the seismogenic environment, seismic recurrence periods of strong historical earthquakes, precise locations of small–moderate earthquakes, and Coulomb stress changes of moderate–strong earthquakes, we analyze the potential locking status of a seismically quiet segment of Xianshuihe fault between Daofu County and Kangding City (SDK). The interseismic surface velocities between 1999 and 2017 are obtained from updated global positioning system (GPS) observations in this region. After removing the post-seismic relaxation effect caused by the 2008 Mw 7.9 Wenchuan earthquake that occurred around the fault segment, the observed velocities reveal a pronounced symmetric slip pattern along the SDK trace. The far field slip rate is 7.8 ± 0.4 mm/a, and the fault SDK is confirmed to be in an interseismic silent phase. The optimal locking depth is estimated at 7 km, which is perfectly distributed on the upper edge of the relocated hypocenters. A moment deficit analysis shows cumulative seismic moment between 1955 and 2018, corresponding to an Mw 6.6 event. Finally, based on a viscoelastic deformation model, we find that moderate–strong earthquakes in the surrounding area increase the Coulomb stress level by up to 2 bars on the SDK, significantly enhancing the future seismic potential.

RELATIONSHIP BETWEEN ENDOGENOUS SALICYLIC ACID AND ANTIOXIDANT ENZYME ACTIVITIES IN MAIZE SEEDLINGS UNDER CHILLING STRESS

2013 ◽  
Vol 49 (2) ◽  
pp. 295-308 ◽  
Author(s):  
YANG WANG ◽  
TINGTING WEN ◽  
JIN HU ◽  
RUI HAN ◽  
YANFANG ZHU ◽  
...  
Keyword(s):  
Salicylic Acid ◽  
Antioxidant Enzymes ◽  
Antioxidant Enzyme ◽  
Enzyme Activities ◽  
Chilling Stress ◽  
Antioxidant Enzyme Activities ◽  
Maize Seedlings ◽  
Stress Changes ◽  
Positive Correlations ◽  
The Relationship

SUMMARYSalicylic acid (SA) can induce multiple stress tolerance in plants. This study investigated the relationship between SA and antioxidant enzyme activities in maize seedlings under chilling stress. Changes of endogenous SA, antioxidant enzyme activities and malondialdehyde (MDA) concentrations were assessed in two different chilling-tolerant maize inbred lines (Huang C and Mo17) under chilling stress. The results showed that both endogenous free and bound salicylic acid contents increased in roots and leaves of both lines. MDA concentrations also increased significantly in roots and leaves of both lines after chilling stress. In addition, in Huang C, chilling stress increased the activities of four antioxidant enzymes, ascorbate peroxidase (APX), catalase (CAT), glutathione reductase (GR) and peroxidase, while in Mo17, only CAT and APX increased. Furthermore, a regression analysis was conducted between SA and MDA concentrations or antioxidant enzyme activities under chilling stress. The results indicated that MDA concentrations were positively correlated with total SA contents in roots (r = 0.9776, p = 0.0224) and bound SA in leaves (r = 0.9974, p = 0.0458), respectively. Total SA contents had positive correlations with APX activities both in roots (r = 0.9993, p = 0.002) and leaves (r = 0.9630, p = 0.037) and GR in leaves (r = 0.9298, p = 0.0221). Together, these results suggested that chilling stress improved the biosynthesis of endogenous SA, and lipid peroxidation and antioxidant enzyme activities could be indicated by endogenous SA contents of maize seedlings under chilling stress. Furthermore, increased activities of antioxidant enzymes, especially in roots, may contribute to the chilling tolerance of maize seedlings.

scholarly journals INFLUENCE OF STRESS TRANSFER IN PROBABILITY ESTIMATES OF M≥6.5 EARTHQUAKES IN GREECE AND SURROUNDING AREAS

2017 ◽  
Vol 43 (4) ◽  
pp. 2114
Author(s):  
P. M. Paradisopoulou ◽  
E. E. Papadimitriou ◽  
V. G. Karakostas ◽  
S. Lasocki ◽  
J. Mirek ◽  
...  
Keyword(s):  
Stress Transfer ◽  
Transient Effects ◽  
Strong Earthquakes ◽  
Earthquake Probability ◽  
Probability Estimates ◽  
Stress Changes ◽  
Coulomb Failure ◽  
Earthquake Nucleation ◽  
Major Fault ◽  
Surrounding Areas

The coseismic stress changes due to strong earthquakes (M>6.5) that occurred in Greece and its adjacent areas since the beginning of the 20th century (instrumental era) are calculated and the future seismic hazard expressed in terms of the probabilities of occurrence of M≥6.5 events is assessed. Calculations of the change in Coulomb failure stress reveal that 61 out of 67 ruptures were brought closer to failure by the preceding shocks. A new insight on the evaluation of future seismic hazards, in the study area, is given by translating the calculated coseismic stress changes into earthquake probability. We incorporated the effect of stress change into the time–depended probability estimates using an earthquake nucleation constitutive relation, which includes both permanent and transient effects of stress changes. Taking into account the current stress changes onto each major fault, the probability calculations were performed and given for the whole study area during the next 30 years

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