Pub Date : 2022-04-11DOI: 10.1007/s11600-022-00768-w
M. Mobarki, A. Talbi
{"title":"Spatio-temporal analysis of main seismic hazard parameters in the Ibero–Maghreb region using an Mw- homogenized catalog","authors":"M. Mobarki, A. Talbi","doi":"10.1007/s11600-022-00768-w","DOIUrl":"https://doi.org/10.1007/s11600-022-00768-w","url":null,"abstract":"","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2022-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53117750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-30DOI: 10.21203/rs.3.rs-1191959/v1
Aakash De, I. Mondal, S. Nandi, S. Thakur, M. Raman, T. De
This study aims to explore the variations in spatial/Spatio-temporal characteristics of water quality parameters of three estuaries in the western part of the Indian Sundarbans. Reliable retrieval of near surface concentrations of parameters such as Chlorophyll-a, SST & TSM in various aquatic ecosystems with broad ranges of trophic needs has long been a complex issue. In this study the C2RCC processor has been applied that has been tested for its accuracy across different bio optical regimes in inland & coastal waters. Satellite images for the same period were also collected and analysed using the C2RCC processing sequence to retrieve values of parameters such as the depth of water, surface reflectance, water temperature, inherent optical properties (IOPs), salinity, chlorophyll-a and total suspended matter (TSM) using the SNAP software. During the 2017-2020 season, in situ sampling from specific locations and laboratory water quality analysis were carried out. The OLCI retrieved results were then trained and validated using the in situ datasets. It was observed that the highest amount of TSM was recorded in Diamond Harbour during the pre-monsoon, in the year 2018 (301.40 mgL-1 in-situ value, and 308.54 mg L-1 estimated value). Similarly, chlorophyll-a had higher concentrations during the monsoon season (3.03 mg m-3, in-situ, and 2.96 mg m-3, estimated) in Fraserganj and Sagar south points. Very good fitted correlation results for all seasons between Chl-a, r = 0.829 and TSM, r = 0.924 were found during the comparisons of OLCI and in situ results. The high level of correlation highlights the importance of both primary and secondary data in understanding any dynamic system properly. Finally, the result shows that the water quality model outperforms conventional techniques and OLCI chl-a and TSM products. This paper empirically investigates a reliable remote sensing method for estimating coastal TSM and chl-a concentrations and supports the use of OLCI data in ocean colour remote sensing.
{"title":"Estimation of Chlorophyll-a, SPM and Salinity in Mangrove Dominated Tropical Estuarine Areas of Hooghly River, North East Coast of Bay of Bengal, India Using Sentinel-3 Data","authors":"Aakash De, I. Mondal, S. Nandi, S. Thakur, M. Raman, T. De","doi":"10.21203/rs.3.rs-1191959/v1","DOIUrl":"https://doi.org/10.21203/rs.3.rs-1191959/v1","url":null,"abstract":"\u0000 This study aims to explore the variations in spatial/Spatio-temporal characteristics of water quality parameters of three estuaries in the western part of the Indian Sundarbans. Reliable retrieval of near surface concentrations of parameters such as Chlorophyll-a, SST & TSM in various aquatic ecosystems with broad ranges of trophic needs has long been a complex issue. In this study the C2RCC processor has been applied that has been tested for its accuracy across different bio optical regimes in inland & coastal waters. Satellite images for the same period were also collected and analysed using the C2RCC processing sequence to retrieve values of parameters such as the depth of water, surface reflectance, water temperature, inherent optical properties (IOPs), salinity, chlorophyll-a and total suspended matter (TSM) using the SNAP software. During the 2017-2020 season, in situ sampling from specific locations and laboratory water quality analysis were carried out. The OLCI retrieved results were then trained and validated using the in situ datasets. It was observed that the highest amount of TSM was recorded in Diamond Harbour during the pre-monsoon, in the year 2018 (301.40 mgL-1 in-situ value, and 308.54 mg L-1 estimated value). Similarly, chlorophyll-a had higher concentrations during the monsoon season (3.03 mg m-3, in-situ, and 2.96 mg m-3, estimated) in Fraserganj and Sagar south points. Very good fitted correlation results for all seasons between Chl-a, r = 0.829 and TSM, r = 0.924 were found during the comparisons of OLCI and in situ results. The high level of correlation highlights the importance of both primary and secondary data in understanding any dynamic system properly. Finally, the result shows that the water quality model outperforms conventional techniques and OLCI chl-a and TSM products. This paper empirically investigates a reliable remote sensing method for estimating coastal TSM and chl-a concentrations and supports the use of OLCI data in ocean colour remote sensing.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2021-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44718685","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-06-10DOI: 10.1007/s11600-021-00615-4
A. Salman, S. S. Hassan, G. Khan, M. A. Goheer, A. Khan, K. Sheraz
{"title":"HEC-RAS and GIS-based flood plain mapping: A case study of Narai Drain Peshawar","authors":"A. Salman, S. S. Hassan, G. Khan, M. A. Goheer, A. Khan, K. Sheraz","doi":"10.1007/s11600-021-00615-4","DOIUrl":"https://doi.org/10.1007/s11600-021-00615-4","url":null,"abstract":"","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2021-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s11600-021-00615-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53117690","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-27DOI: 10.21203/RS.3.RS-528343/V1
Yogendra Sharma, S. Pasari, K. Ching
Using an updated set of GPS surface velocities, the present study provides fault locking behavior and slip rate distribution of the Main Himalayan Thrust (MHT) along the central Himalaya. The two-dimensional velocity field is inverted through Bayesian inversion to estimate fault geometry and kinematic parameters of the MHT along the central Himalaya. The modeling results reveal that: (1) MHT is fully locked in the upper flat (0-9 km), partially locked along the mid-crustal ramp (15-21 km), and it is creeping in the deeper flat (> 21 km); (2) there is an insignificant slip rate of MHT along the locked-to-creeping transition zone, indicating its partially coupled/locked behavior; (3) along the deeper flat of the MHT, the estimated creeping rate is ~16.3 mm/yr, ~14.7 mm/yr, and ~14.3 mm/yr along western, central, and eastern Nepal, respectively; and (4) along the MHT on the upper crust, the modeled locking width turns out to be 97 km, 106 km, and 129 km in the western, central, and eastern Nepal, respectively. In addition, the posterior probability distribution of the locking width exhibits a bimodal Gaussian distribution coinciding with the two ramp geometry of the MHT along the western Nepal. Along the foothills of the Higher Himalaya, the inferred locking line is also aligned to the estimated maximum shear strain concentration and observed seismicity along the central Himalaya. With a general agreement to the previous geodetic results, geological estimates, and background seismicity, our findings provide a promising avenue of the contemporary crustal deformation along the Nepal Himalaya. The estimated inversion results in a Bayesian framework exhibit updated fault kinematics of the MHT and hence provides valuable inputs for seismic hazard assessment along the central Himalaya.
{"title":"Kinematics of Crustal Deformation along the Central Himalaya","authors":"Yogendra Sharma, S. Pasari, K. Ching","doi":"10.21203/RS.3.RS-528343/V1","DOIUrl":"https://doi.org/10.21203/RS.3.RS-528343/V1","url":null,"abstract":"\u0000 Using an updated set of GPS surface velocities, the present study provides fault\u0000locking behavior and slip rate distribution of the Main Himalayan Thrust (MHT) along\u0000the central Himalaya. The two-dimensional velocity field is inverted through Bayesian\u0000inversion to estimate fault geometry and kinematic parameters of the MHT along the\u0000central Himalaya. The modeling results reveal that: (1) MHT is fully locked in the upper\u0000flat (0-9 km), partially locked along the mid-crustal ramp (15-21 km), and it is creeping\u0000in the deeper flat (> 21 km); (2) there is an insignificant slip rate of MHT\u0000along the locked-to-creeping transition zone, indicating its partially coupled/locked\u0000behavior; (3) along the deeper flat of the MHT, the estimated creeping rate is ~16.3\u0000mm/yr, ~14.7 mm/yr, and ~14.3 mm/yr along western, central, and eastern Nepal,\u0000respectively; and (4) along the MHT on the upper crust, the modeled locking width\u0000turns out to be 97 km, 106 km, and 129 km in the western, central, and eastern Nepal,\u0000respectively. In addition, the posterior probability distribution of the locking width\u0000exhibits a bimodal Gaussian distribution coinciding with the two ramp geometry of the\u0000MHT along the western Nepal. Along the foothills of the Higher Himalaya, the inferred\u0000locking line is also aligned to the estimated maximum shear strain concentration and\u0000observed seismicity along the central Himalaya. With a general agreement to the\u0000previous geodetic results, geological estimates, and background seismicity, our\u0000findings provide a promising avenue of the contemporary crustal deformation along the\u0000Nepal Himalaya. The estimated inversion results in a Bayesian framework exhibit\u0000updated fault kinematics of the MHT and hence provides valuable inputs for seismic\u0000hazard assessment along the central Himalaya.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41277323","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-02-01DOI: 10.1007/S11600-019-00390-3
Zahra Alizadeh Zakaria, F. F. Ahmadi
{"title":"Possibility of an earthquake prediction based on monitoring crustal deformation anomalies and thermal anomalies at the epicenter of earthquakes with oblique thrust faulting","authors":"Zahra Alizadeh Zakaria, F. F. Ahmadi","doi":"10.1007/S11600-019-00390-3","DOIUrl":"https://doi.org/10.1007/S11600-019-00390-3","url":null,"abstract":"","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/S11600-019-00390-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53117172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-10-30DOI: 10.1007/s11600-019-00380-5
Mousaab Zakhrouf, H. Bouchelkia, Madani Stamboul, Sungwon Kim
{"title":"Novel hybrid approaches based on evolutionary strategy for streamflow forecasting in the Chellif River, Algeria","authors":"Mousaab Zakhrouf, H. Bouchelkia, Madani Stamboul, Sungwon Kim","doi":"10.1007/s11600-019-00380-5","DOIUrl":"https://doi.org/10.1007/s11600-019-00380-5","url":null,"abstract":"","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2019-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s11600-019-00380-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53117118","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2018-08-01DOI: 10.1007/s11600-018-0143-0
C. Garijo, L. Mediero
{"title":"Influence of climate change on flood magnitude and seasonality in the Arga River catchment in Spain","authors":"C. Garijo, L. Mediero","doi":"10.1007/s11600-018-0143-0","DOIUrl":"https://doi.org/10.1007/s11600-018-0143-0","url":null,"abstract":"","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2018-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s11600-018-0143-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"53117054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shuang-Chao Ge, M. Deng, Kai Chen, Bin Li, Yuan Li
Time-domain induced polarization (TDIP) measurement is seriously affected by power line interference and other field noise. Moreover, existing TDIP instruments generally output only the apparent chargeability, without providing complete secondary field information. To increase the robustness of TDIP method against interference and obtain more detailed secondary field information, an improved data-processing algorithm is proposed here. This method includes an efficient digital notch filter which can effectively eliminate all the main components of the power line interference. Hardware model of this filter was constructed and Vhsic Hardware Description Language code for it was generated using Digital Signal Processor Builder. In addition, a time-location method was proposed to extract secondary field information in case of unexpected data loss or failure of the synchronous technologies. Finally, the validity and accuracy of the method and the notch filter were verified by using the Cole-Cole model implemented by Simulink software. Moreover, indoor and field tests confirmed the application effect of the algorithm in the fieldwork.
{"title":"Improved Data Preprocessing Algorithm for Time-Domain Induced Polarization Method with Digital Notch Filter","authors":"Shuang-Chao Ge, M. Deng, Kai Chen, Bin Li, Yuan Li","doi":"10.1515/acgeo-2016-0015","DOIUrl":"https://doi.org/10.1515/acgeo-2016-0015","url":null,"abstract":"Time-domain induced polarization (TDIP) measurement is seriously affected by power line interference and other field noise. Moreover, existing TDIP instruments generally output only the apparent chargeability, without providing complete secondary field information. To increase the robustness of TDIP method against interference and obtain more detailed secondary field information, an improved data-processing algorithm is proposed here. This method includes an efficient digital notch filter which can effectively eliminate all the main components of the power line interference. Hardware model of this filter was constructed and Vhsic Hardware Description Language code for it was generated using Digital Signal Processor Builder. In addition, a time-location method was proposed to extract secondary field information in case of unexpected data loss or failure of the synchronous technologies. Finally, the validity and accuracy of the method and the notch filter were verified by using the Cole-Cole model implemented by Simulink software. Moreover, indoor and field tests confirmed the application effect of the algorithm in the fieldwork.","PeriodicalId":50898,"journal":{"name":"Acta Geophysica","volume":null,"pages":null},"PeriodicalIF":2.3,"publicationDate":"2016-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/acgeo-2016-0015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67087756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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