Geofizika最新文献_第3页

Interpretation of the magnetic anomalies over the Mid-Atlantic Ocean Ridge using Swarm-A satellite Swarm-A卫星对大西洋中脊磁异常的解释

IF 1 4区地球科学

Geofizika Pub Date : 2022-03-31 DOI: 10.15233/gfz.2022.39.3

Ilkin Özsöz, Ankaya Pamukçu

引用次数: 0

Development of a NWP based Integrated Block Level Forecast System (IBL-FS) using statistical post-processing technique for the state Jharkhand (India) 利用统计后处理技术为贾坎德邦（印度）开发基于NWP的综合区块水平预测系统（IBL-FS）

IF 1 4区地球科学

Geofizika Pub Date : 2022-03-31 DOI: 10.15233/gfz.2022.39.6

S. D. Kotal, R. Sharma

{"title":"Development of a NWP based Integrated Block Level Forecast System (IBL-FS) using statistical post-processing technique for the state Jharkhand (India)","authors":"S. D. Kotal, R. Sharma","doi":"10.15233/gfz.2022.39.6","DOIUrl":"https://doi.org/10.15233/gfz.2022.39.6","url":null,"abstract":"A statistical post-processing forecast system for medium range predictions using the GFS model has been developed for Jharkhand (India) with the aim of improving rainfall and temperature predictions for agricultural applications. The basis of the integrated block level forecast system (IBL-FS) build includes (i) Decaying weighted mean (DWM) bias correction technique, (ii) Value addition and (iii) Inverse distance squared weighted (IDSW) interpolation. In the first step, model bias corrected district level forecast for 24 districts of Jharkhand is generated from the output of numerical GFS model (T1534L64) by applying DWM bias correction technique. In the second step, these bias corrected forecasts are value-added using forecast from various NWP models and synoptic methods. Finally in the third step, the IDSW interpolation method is used to generate the forecast at an unmeasured block from the value-added district level forecast of the surrounding districts. The value-added forecast for 263 blocks for the state Jharkhand is prepared up to medium range time scale (120h). The performance skill of IBL-FS is evaluated for rainfall during monsoon season 2018 and 2019, for minimum temperature during winter season 2019, and for maximum temperature during summer season 2019 using different statistical metrics. The skill of IBL-FS is found to be higher than the direct model forecast (DMFC) by 15% to 43% for minimum temperature, by 18% to 41% for maximum temperature, and by 22% to 30% for rainfall forecast for day1 to day5 forecasts. This study concludes that the integrated approach is more skillful than DMFC for real time forecasts and useful for farming for the blocks of Jharkhand.","PeriodicalId":50419,"journal":{"name":"Geofizika","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49520584","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}

引用次数: 0

Korištenje Varimax Norm metode za poboljšanje i prepoznavanje rubnih podataka polja potencijala 使用Varimax范数方法改进和识别势场的边际数据

IF 1 4区地球科学

Geofizika Pub Date : 2022-03-31 DOI: 10.15233/gfz.2022.39.1

Jiayong Yan, Xu Wang, Yongqian Zhang, Chong Zhang, Fan Luo, Zhihui Wang

引用次数: 0

PM10 and the air quality stress index in an industrial city of Eastern Mediterranean 东地中海某工业城市PM10与空气质量压力指数

IF 1 4区地球科学

Geofizika Pub Date : 2022-03-31 DOI: 10.15233/gfz.2022.39.4

Eleni Verouti, Dimitrios Gavathas, Anastasios Mavraki

引用次数: 0

Long-term measurements at Bakar tide-gauge station (east Adriatic) 巴卡尔潮汐计站(东亚得里亚海)的长期测量

IF 1 4区地球科学

Geofizika Pub Date : 2022-03-21 DOI: 10.15233/gfz.2022.39.8

Iva Međugorac, M. Pasarić, M. Orlić

引用次数: 2

Calibration of shaking intensity models of the “Extremum” system to simulate loss due to the 2020 Croatia earthquakes 校准“极值”系统的震动强度模型，以模拟2020年克罗地亚地震造成的损失

IF 1 4区地球科学

Geofizika Pub Date : 2022-01-24 DOI: 10.15233/gfz.2021.38.8

S. Markušić, N. Malaeva, S. Suchshev, I. Gabsatarova, N. Frolova

引用次数: 0

The public response and educational outreach through social media after the Zagreb earthquake of 22 March 2020 2020年3月22日萨格勒布地震后通过社交媒体的公众反应和教育宣传

IF 1 4区地球科学

Geofizika Pub Date : 2022-01-24 DOI: 10.15233/gfz.2021.38.7

M. Mustać, I. Dasović, Helena Latečki, I. Cecić

{"title":"The public response and educational outreach through social media after the Zagreb earthquake of 22 March 2020","authors":"M. Mustać, I. Dasović, Helena Latečki, I. Cecić","doi":"10.15233/gfz.2021.38.7","DOIUrl":"https://doi.org/10.15233/gfz.2021.38.7","url":null,"abstract":"Following the 22 March 2020 ML 5.5 earthquake near Zagreb, Croatia, the citizens became increasingly interested in earthquakes and the multitude of simultaneous visitors caused the webpage with Croatian Seismological Survey reports on earthquakes to crash. To remedy the situation, seismologists used social network accounts to provide information, using the opportunity to educate the citizens on basic concepts of seismology, earthquake preparedness and the occurring seismic sequence. Citizens’ feedback was useful to improve the communication, but required extensive moderation. In July 2020, three seismologists from the Department of Geophysics, Faculty of Science, University of Zagreb, one from the Slovenian Environment Agency, and a psychologist from the Croatian Catholic University conducted a poll to find out which sources of information citizens mostly use, their knowledge about earthquakes, and the level of fear they were experiencing due to the earthquakes. Most respondents relied on institutional sources of information and their knowledge on different aspects of earthquake preparedness increased relatively compared to the time before the earthquake. The majority of respondents was extremely worried on the day of the mainshock, predominantly because they were concerned of a possible stronger event, their safety and the safety of their close ones.","PeriodicalId":50419,"journal":{"name":"Geofizika","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41745440","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}

引用次数: 3

Geodetic and seismological analysis of the CROPOS ZAGR station kinematics during the Zagreb 2020 ML 5.5 earthquake 2020年萨格勒布5.5级地震期间CROPOS ZAGR台站运动学的大地测量和地震学分析

IF 1 4区地球科学

Geofizika Pub Date : 2022-01-24 DOI: 10.15233/gfz.2021.38.10

D. Sugar, Z. Bacic, I. Dasović

{"title":"Geodetic and seismological analysis of the CROPOS ZAGR station kinematics during the Zagreb 2020 ML 5.5 earthquake","authors":"D. Sugar, Z. Bacic, I. Dasović","doi":"10.15233/gfz.2021.38.10","DOIUrl":"https://doi.org/10.15233/gfz.2021.38.10","url":null,"abstract":"The CROPOS’s ZAGR stations, one of 33 stations of the Croatian permanent GNSS (Global Navigation Satellite System) network CROPOS (Croatian Positioning System), is located in Zagreb’s city centre. For the first time, motion of one of the CROPOS stations (the ZAGR station) during an earthquake shake (the Zagreb 2020 ML5.5) was analysed by the PPK (Post-Processed Kinematic) method using all available GNSS signals (GPS – Global Positioning System, GLONASS – GLObalnaya NAvigatsionnaya Sputnikovaya Sistem, Galileo, Bei-Dou) and seismologically interpreted. The ZAGR station is situated about 9 km to the south-southeast of the earthquake’s epicentre. The analysis showed that the station’s movements, i.e. combined surface and building motion, during the shake was far above the noise level and enabled the assessment of the station’s kinematics: movements in the range of approx. 13 cm in direction north–south (N–S) and approx. 6 cm in direction east–west (E–W). However, movements in the vertical direction were slightly above the noise level. Even though the ZAGR station kinematic behaviour was pronounced, no permanent displacement was identified. The seismological analysis showed that the ZAGR station recorded the onset of the SV-waves on the N–S component, surface waves on the N–S (predominantly Rayleigh waves) and E–W (mainly Love waves) components. The resolution of 1 s of the results of the PPK method have enabled a thorough analysis of the ZAGR station kinematics and pointed out the usefulness of the method in earthquake observations.","PeriodicalId":50419,"journal":{"name":"Geofizika","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47496603","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}

引用次数: 0

Properties of the Zagreb 22 March 2020 earthquake sequence 2020年3月22日萨格勒布地震序列的特性

IF 1 4区地球科学

Geofizika Pub Date : 2022-01-24 DOI: 10.15233/gfz.2021.38.6

M. Herak, D. Herak, Niksa Orlic

{"title":"Properties of the Zagreb 22 March 2020 earthquake sequence","authors":"M. Herak, D. Herak, Niksa Orlic","doi":"10.15233/gfz.2021.38.6","DOIUrl":"https://doi.org/10.15233/gfz.2021.38.6","url":null,"abstract":"Although strong and damaging earthquakes have hit Zagreb in the past, the 22 March 2020 earthquake (Mw 5.4) is the first one that was recorded by a modern digital local seismic network, and which could be analysed not only by macroseismic methods, but also by microseismic ones. Herewith we used the 3003 carefully analysed and located events from the first year of the aftershock sequence to learn more about the aftershock rate decay, their magnitude distribution, focal mechanisms and hypocentral locations. The aftershock activity rate was found to closely follow the modified Omori law, and fault-plane solutions for 10 events indicated prevailing pure-reverse faulting. Our analyses suggest that the reverse North Medvednica boundary fault (NMBF) was the causative fault, as it fits with the focal mechanisms and with the geometry of aftershock locations.\u0000The epicentral area was of a triangular shape with the mainshock in one vertex, and the opposite side of the triangle lying parallel to the surface trace of the NMBF. The hypocentres of aftershocks were predominantly located in the hanging wall of the fault. No surface break was observed, so the rupture is assumed to be buried. These facts were interpreted as a combination of the effect of conservation of mass (seismic flow) requiring some fault-parallel stress redistribution and transfer of material, and the fault loading and activation in the compressive environment controlled by the stress partition at the brittle-ductile transition zone within the crust. The later process involves compression within the hanging wall during the interseismic stage when the fault segment in the brittle crust is locked, followed by sudden dilatation during the rupture phase.","PeriodicalId":50419,"journal":{"name":"Geofizika","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41413884","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}

引用次数: 4

Semi-empirical estimation of the Zagreb ML 5.5 earthquake (2020) ground motion amplification by 1D equivalent linear site response analysis 通过1D等效线性场地反应分析对萨格勒布ML 5.5地震（2020）地震动放大的半经验估计

IF 1 4区地球科学

Geofizika Pub Date : 2022-01-24 DOI: 10.15233/gfz.2021.38.9

Jakov Stanislav Uglešić, S. Markušić, B. Padovan, D. Stanko

{"title":"Semi-empirical estimation of the Zagreb ML 5.5 earthquake (2020) ground motion amplification by 1D equivalent linear site response analysis","authors":"Jakov Stanislav Uglešić, S. Markušić, B. Padovan, D. Stanko","doi":"10.15233/gfz.2021.38.9","DOIUrl":"https://doi.org/10.15233/gfz.2021.38.9","url":null,"abstract":"The 22 March 2020 Zagreb ML 5.5 earthquake ground shaking resulted in damage to buildings and infrastructure. The most affected buildings were older and cultural heritage buildings (built before 1963) in the old city centre with significant damage extent in the epicentral zone (southeastern foothills of Medvednica Mt.). This study presents site response analysis on the realistic site profiles from the epicentre towards the accelerometric stations QUHS and QARH and comparison with strong motion data recorded during the Zagreb 2020 earthquake. Semi-empirical estimation of the ground motion amplification (i.e., peak ground acceleration at surface) showed that modelled and recorded values are comparable. Moreover, we present 2D model of peak ground acceleration at surface (PGAsurf ) variation for the superimposed site profile from the epicentre towards two accelerometric stations. Ground motion amplification for the Zagreb ML 5.5 earthquake scenario showed that PGAsurf is larger by a factor of 2 than the bedrock value (approx. 0.35 g in the epicentre and 0.20 g on the 12 km distant accelerometric station). This study is a contribution to better understanding of the Zagreb ML 5.5 earthquake effects and significance of local site effects in the damage extent, something that combined with older and heritage buildings resulted in high economic consequences. Therefore, it is important that site-specific ground motion simulation and seismic microzonation of the Zagreb continues with installation of an accelerometric array. This is very important for earthquake retrofitting and resilience of the low, mid- and high-rise buildings with particular care of cultural and historical buildings as well for the further urban planning.","PeriodicalId":50419,"journal":{"name":"Geofizika","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42874764","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}

引用次数: 1