scholarly journals Himalayan Tectonic Belt: Morlet Wavelet Variation and Seismic Harmony

2021 ◽  
Author(s):  
Yebang Xu ◽  
Paul W. Burton
Keyword(s):  
Wavelet Analysis ◽  
Common Property ◽  
Temporal Distribution ◽  
Tectonic Stress ◽  
Morlet Wavelet ◽  
Tectonic Zone ◽  
Plate Convergence ◽  
Musical Harmony ◽  
New Family ◽  
Tectonic Belt

AbstractMorlet wavelet analysis is a method of studying the periodic spectrum of non-stationary physical signals and is applied to the Himalayan Tectonic Belt to explore whether there is any seismic periodicity, and to explore the possibility of harmony or commonality of properties among the seismic activities of different zones. The earthquake sequence during 1951–2016 with magnitudes M ≥ 6.0 is analysed. Wavelet non-periodicity for the Centre zone suggests a non-uniform spatial–temporal distribution of earthquake movement between plates which may relate with the rare great earthquakes, while the periodicities for the west and east zones may suggest the concurrence with the adjustment of the tectonic movement of the east- and west-end regions of the Himalayan Tectonic Belt relative to its central core. These three zones collectively form the Himalayan Tectonic Belt. This contains a periodicity of about five years of seismic activity that tests successfully with a 95% confidence statistic. Borrowing from the concept of musical harmony, this is the significant seismic harmonic which reflects the Belt’s pervasive tectonic stress and an overall harmony of continent–continent plate convergence. Morlet wavelet analysis also reveals the Himalayan Tectonic Belt and the Pamir–Hindu Kush Tectonic Zone to be engaged as a big new family: the Himalayan Tectonic Belt Plus. It is demonstrated that this new whole also has seismic harmony with the common property again being the 5-year periodicity. This indicates a unified structure of pervading active stress and seismic harmony permeating the overall seismicity.

scholarly journals Exploring the Relationship between Rising Temperatures and the Number of Climate-Related Natural Disasters in China

2021 ◽  
Vol 18 (2) ◽  
pp. 745
Author(s):  
Mingan Zhu ◽  
Bihang Fan
Keyword(s):  
Wavelet Analysis ◽  
Natural Disasters ◽  
Natural Disaster ◽  
Temperature Drop ◽  
Morlet Wavelet ◽  
Temperature Cycle ◽  
Cycle Period ◽  
Considerable Influence ◽  
Elasticity Coefficient ◽  
The Relationship

Warming has strongly influenced the quantity and variability of natural disasters around the globe. This study aims to characterize the varying patterns between rising temperatures and climate-related natural disasters in China from 1951 to 2010. We examined the overall trend in the patterns of an 11-year cycle, and climate-related natural disaster responses to periods of rising and dropping temperature. We used Morlet wavelet analysis to determine the length of a temperature cycle period, and the arc elasticity coefficient to assess the number of climate-related natural disasters in response to the changing temperature. We found that: (1) the overall relationship between temperature and the number of climate-related natural disasters was positive; (2) however, on the cycle level, the pattern of climate-related natural disasters was found to be independent of temperature variation; (3) on the rise-drop level, temperature increases were associated with declines in the number of climate-related natural disasters. Moreover, as temperature decreased, the number of climate-related natural disasters increased substantially, such that temperature had a more considerable influence on the quantity of climate-related natural disasters during the temperature-drop period. Findings in this study can help enhance the dissemination of warning and mitigation efforts to combat natural disasters in the changing climate.

scholarly journals Morlet Wavelet Analysis of ML ≥ 3 Earthquakes in the Taipei Metropolitan Area

2015 ◽  
Vol 26 (2-1) ◽  
pp. 83 ◽  
Author(s):  
Kou-Cheng Chen ◽  
Jeen-Hwa Wang ◽  
Kwang-Hee Kim ◽  
Win-Gee Huang ◽  
Kao-Hao Chang ◽  
...  
Keyword(s):  
Wavelet Analysis ◽  
Metropolitan Area ◽  
Morlet Wavelet

Study on Seismicity and Its Geodynamic Genesis in Ngari Areas

2020 ◽  
Author(s):  
Guangyin Xu ◽  
Qing Wu ◽  
Suyun Wang
Keyword(s):  
Stress Field ◽  
Focal Mechanism ◽  
Seismic Activity ◽  
Tectonic Stress ◽  
Earthquake Catalogue ◽  
Tectonic Stress Field ◽  
Eurasian Plate ◽  
The North ◽  
East Kunlun ◽  
Tectonic Belt

<p>The Ngari area in Tibet is in the forefront of land-continent collisions. The area is accompanied by the polymerization of plates, forming complex structures such as the Tethys Himalayan pleat belt, the Yarlung Zangbo suture belt, and the Gangdese continental margin magma arc from the south to the north. The multi-period dive collision-inland convergence process, the geological structure is complex and the seismicity is very high. Based on the Chinese historical earthquake catalogue, the China Modern Earthquake Catalogue and the seismic data from the International Seismological Center (ISC), we analyzed the seismic activity, focal mechanism and modern tectonic stress field in the Ngari area, and then analyzed the seismicity and its source of geodynamics. The main conclusions are as follows:(1) The seismic activities in the Ngari area are mainly distributed in the Himalayan tectonic belt, the Bangong-Nujiang tectonic belt, the Alkin-East Kunlun tectonic belt, and some near north-south trending tectonic belts; (2) Earthquakes near the Himalayan tectonic belt is dominated by reverse faulting events. The seismic activity near the Bangong-Nujiang tectonic belt and the Alkin-East Kunlun tectonic belt is dominated by strike-slip earthquakes. Near the north-south extensional tectonic belt, the earthquakes show as the normal faulting events. (3) The main direction of the modern tectonic stress field in the study area is near north-south direction; (4) Seismic activity, focal mechanism and modern tectonic stress field show that the geodynamic source in the Ngari region is from Collision and squeezing the between the Eurasian plate and the Indian Ocean plate.</p>

scholarly journals Analysis of Agile Canine Gait Characteristics Using Accelerometry

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4379 ◽  
Author(s):  
Hasti Hayati ◽  
Fatemeh Mahdavi ◽  
David Eager
Keyword(s):  
Wavelet Analysis ◽  
Morlet Wavelet ◽  
Frame Rate ◽  
High Rate ◽  
Measurement Unit ◽  
Contributing Factors ◽  
Severe Injuries ◽  
Speed Reduction ◽  
Morlet Wavelet Transform ◽  
The Time Domain

The high rate of severe injuries associated with racing greyhounds poses a significant problem for both animal welfare and the racing industry. Using accelerometry to develop a better understanding of the complex gait of these agile canines may help to eliminate injury contributing factors. This study used a single Inertial Measurement Unit (IMU) equipped with a tri-axial accelerometer to characterise the galloping of thirty-one greyhounds on five different race tracks. The dorsal-ventral and anterior-posterior accelerations were analysed in both the time and frequency domains. The fast Fourier transform (FFT) and Morlet wavelet transform were applied to signals. The time-domain signals were synced with the corresponding high frame rate videos of the race. It was observed that the acceleration peaks in the dorsal-ventral accelerations correspond to the hind-leg strikes which were noted to be fifteen times the greyhound’s weight. The FFT analysis showed that the stride frequencies in all tracks were around 3.5 Hz. The Morlet wavelet analysis also showed a reduction in both the frequency and magnitude of signals, which suggests a speed reduction throughout the race. Also, by detecting abrupt changes along the track, the wavelet analysis highlighted potentially hazardous locations on the track. In conclusion, the methods applied in this research contribute to animal safety and welfare by eliminating the factors leading to injuries through optimising the track design and surface type.

scholarly journals Characterization of Monsoonal Rainfall in the Sudano-Sahelian Zone of Northwestern Nigeria

2021 ◽  
Vol 1 (2) ◽  
pp. 123-135
Author(s):  
Abdullahi Umar ◽  
Saadu Umar Wali ◽  
Ibrahim Mustapha Dankani
Keyword(s):  
Wavelet Transform ◽  
Wavelet Analysis ◽  
Daily Rainfall ◽  
Kendall Test ◽  
Morlet Wavelet ◽  
Rainfall Data ◽  
Seasonal Rainfall ◽  
Rainfall Characteristics ◽  
Sahelian Zone

Wavelet transform has been underutilized in characterization of rainfall (Real Onset Dates and Real Cessation Dates) in the study area. This study aims at the characterization of monsoonal rainfall. Daily rainfall data of four stations for the period 1981-2018 were collected from Nigerian Meteorological Agency. The Intra-seasonal Rainfall Monitoring Index (IRMI) was generated and used in determining the RODs and RCDs. The Mann–Kendall test was used to detect trends of the rainfall characteristics. Wavelet transform was used in modelling RODs and RCDs. Findings revealed that RODs vary between stations. There is low (0.3 Spearman’s Rank r) correlation between latitudes and Early Cessations (ECs) of rains. The Morlet wavelet analysis revealed that from 1999 to 2018, there were more of EOs and NOs especially in Kano station. We conclude that from 1981 to 2018 there has been a minimal increase in the retreat dates of rainfall in the study area.

scholarly journals New Detrital Apatite Fission Track Thermochronological Constraints on the Meso-Cenozoic Tectono-Thermal Evolution of the Micangshan-Dabashan Tectonic Belt, Central China

2021 ◽  
Vol 9 ◽  
Author(s):  
Tao Tian ◽  
Peng Yang ◽  
Jianming Yao ◽  
Zhonghui Duan ◽  
Zhanli Ren ◽  
...  
Keyword(s):  
Fission Track ◽  
Central China ◽  
Accelerated Cooling ◽  
Lateral Migration ◽  
Apatite Fission Track ◽  
Dabie Orogen ◽  
Tectonic Zone ◽  
Rapid Cooling ◽  
Coupling Process ◽  
Tectonic Belt

The Micangshan-Dabashan tectonic belt, located in the southern Qinling-Dabie Orogen near the northeastern Tibetan Plateau, is a crucial area for understanding the processes and mechanisms of orogenesis. Previous studies have been focused on the cooling process via thermochronology and the mechanism and process of basement uplift have been investigated. However, the coupling process of basement exhumation and sedimentary cap cooling is unclear. The tectono-thermal history constrained by the detrital apatite fission track (AFT) results could provide valuable information for understanding crustal evolution and the coupling process. In this study, we provided new detrital AFT thermochronology results from the Micangshan-Dabashan tectonic belt and obtained nine high-quality tectono-thermal models revealing the Meso-Cenozoic cooling histories. The AFT ages and lengths suggest that the cooling events in the Micangshan area were gradual from north (N) to south (S) and different uplift occurred on both sides of Micangshan massif. The cooling in Dabashan tectonic zone was gradual from northeast (NS) to southwest (SW). The thermal histories show that a relatively rapid cooling since ca. 160 Ma occurred in the Micangshan-Dabashan tectonic belt, which was a response to the event of Qinling orogenic belt entered the intracontinental orogenic deformation. This cooling event may relate to the northeastward dextral compression of the Yangtze Block. The sedimentary cap of Cambriano-Ordovician strata responded positively to this rapid cooling event and entered the PAZ since ca. 63 Ma. The deep buried samples may be limited affected by climate and water erosion and the accelerated cooling was not obvious in the Late Cenozoic. Collectively, the cooling processes of basement and sedimentary cap in Micangshan-Dabashan tectonic belt were inconsistent. The uplift of the sedimentary area is not completely consistent with that of the basement under thrust and nappe action. The rigid basement was not always continuous and rapidly uplifted or mainly showed as lateral migration in a certain stage because of the different intensities and modes of thrust and nappe action, and the plastic sedimentary strata rapidly uplifted due to intense folding deformation.

scholarly journals Identification of solar periodicities in southern African baobab δ13C record

2020 ◽  
Vol 116 (7/8) ◽  
Author(s):  
Pieter B. Kotze
Keyword(s):  
South Africa ◽  
Spectral Analysis ◽  
Wavelet Analysis ◽  
Maximum Entropy ◽  
Carbon Isotope ◽  
Confidence Level ◽  
Morlet Wavelet ◽  
Sunspot Minimum ◽  
Annual Carbon ◽  
Schwabe Cycle

Spectral analysis using wavelet, Lomb–Scargle and maximum entropy techniques of the proxy rainfall record of northeastern South Africa based on annual carbon isotope (δ13C) data obtained from baobab trees for the period 1600 AD – 2000 AD show clear evidence of the presence of characteristic solar periodicities. Solar periodicities that were identified above the 95% confidence level include the ~11-year Schwabe cycle, the ~22-year Hale cycle as well as the 80–110-year Gleissberg cycle. A Morlet wavelet analysis of the δ13C data between 1600 AD and 1700 AD shows the effect of the Maunder sunspot minimum on both the Schwabe and Hale cycles during this time.

Simulation and Test of the Balance Ability for the Elderly Based on Morlet Wavelet Analysis

2019 ◽  
Author(s):  
Guoquan Liu ◽  
Yuezhong Li ◽  
Yiming Chen ◽  
Zehui Lin ◽  
Xinyi Zheng ◽  
...  
Keyword(s):  
Wavelet Analysis ◽  
The Elderly ◽  
Morlet Wavelet ◽  
Balance Ability
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