強(qiáng)震數(shù)據(jù)Kappa值影響因素的討論
發(fā)布時(shí)間：2018-12-27 16:34
【摘要】：許多研究表明,加速度傅里葉幅值譜會(huì)在高頻段出現(xiàn)快速下降這一現(xiàn)象,Anderson與Hough定量地研究了在拐角頻率之上的加速度傅里葉譜的衰減規(guī)律,利用譜衰減參數(shù)Kappa(κ)來(lái)描述這一現(xiàn)象。κ在工程地震領(lǐng)域有著重要應(yīng)用,被地震學(xué)家和工程師廣泛、大量地用于震源、地震動(dòng)模擬和衰減關(guān)系等工作。隨著地震學(xué)方法的廣泛使用,越來(lái)越多學(xué)者研究和討論κ值的影響因素和確定方法,不同學(xué)者使用不同數(shù)據(jù)得到的結(jié)論也不同,κ值可能與震源特性(震級(jí)和震源機(jī)制)、場(chǎng)地條件及傳播途徑等因素有關(guān),但目前仍沒(méi)有得到一致的結(jié)論。本論文重點(diǎn)探討κ值的影響因素。在κ被引入工程地震領(lǐng)域三十多年中,不同的學(xué)者提出了不同的計(jì)算方法,有的適用于強(qiáng)震,有的適用于中小震,有的適用于微震。本文采用的是震級(jí)4.5以上的強(qiáng)震,選用AndersonHough經(jīng)典計(jì)算方法、固定應(yīng)力降計(jì)算方法以及寬帶反演方法計(jì)算κ值。以日本東北地區(qū)(36°N-40°N,138°E-143°E)為研究區(qū),收集2011年1月至2014年1月間震級(jí)大于4.5的512次地震的151個(gè)KiK-net(地表和井下)與189個(gè)K-NET臺(tái)站的記錄。討論傳播途徑、震級(jí)以及局部場(chǎng)地特性對(duì)上述三種方法得到的κ值的影響。研究發(fā)現(xiàn),κ值與震中距有一定的線性關(guān)系,但離散性較大,κ值隨著距離的增加而增加,KiK-net井下數(shù)據(jù)結(jié)果的線性關(guān)系最為明顯;對(duì)每一次地震,線性回歸所有臺(tái)站的κ值與震中距,截距的κ值(κs)表示震中附近的κ值,分析其與震級(jí)的關(guān)系,線性回歸關(guān)系不顯著,震級(jí)的影響不大;對(duì)每一個(gè)臺(tái)站,線性回歸所有κ值與震中距,截距的κ值(κ0)表示臺(tái)站附近的κ值,分析其與30m平均剪切波速VS30和整個(gè)鉆孔深度的平均剪切波速VSd的關(guān)系,κ0隨著平均剪切波速的增加而降低,呈對(duì)數(shù)關(guān)系,但離散性較大,VS30對(duì)κ0的解釋能力強(qiáng)于VSd。最后,本文總結(jié)了主要工作,展望了今后工作,并對(duì)地震動(dòng)衰減關(guān)系的研究中的一個(gè)邏輯問(wèn)題做了初步探討。
[Abstract]:Many studies have shown that the acceleration Fourier amplitude spectrum will decrease rapidly in the high frequency band. Anderson and Hough have quantitatively studied the attenuation law of the acceleration Fourier spectrum above the corner frequency. The spectral attenuation parameter Kappa (魏) is used to describe this phenomenon. 魏 is widely used by seismologists and engineers in the field of engineering seismology, and is widely used in the work of source, earthquake simulation and attenuation. With the wide use of seismological methods, more and more scholars study and discuss the influencing factors and determining methods of 魏 value, and different scholars use different data to get different conclusions. The 魏 value may be associated with the source characteristics (magnitude and focal mechanism). The site condition and the way of transmission are related, but there is still no consistent conclusion. This paper focuses on the influencing factors of 魏 value. In the more than 30 years since 魏 was introduced into the field of engineering earthquake, different scholars have put forward different calculation methods, some of them are suitable for strong earthquakes, some are suitable for small and medium earthquakes, and some are suitable for microearthquakes. In this paper, a strong earthquake with magnitude 4. 5 is used. The classical AndersonHough method, the fixed stress drop calculation method and the wideband inversion method are used to calculate the 魏 value. In this paper, 151 KiK-net (surface and underground) and 189 K-NET stations of 512 earthquakes with magnitude greater than 4.5 between January 2011 and January 2014 were collected from northeast Japan (36 擄N-40 擄Nian 138 擄E-143 擄E). The effects of propagation path magnitude and local site characteristics on the 魏 values obtained by the above three methods are discussed. It is found that there is a linear relationship between 魏 value and epicentral distance, but the dispersion is larger. The 魏 value increases with the increase of distance, and the linear relationship between the results of KiK-net downhole data is the most obvious. For each earthquake, the 魏 value and epicentral distance of all stations are linear regression, and the 魏 value (魏 s) of intercept denotes the 魏 value near the epicenter. The linear regression relation is not significant, but the influence of magnitude is not significant. For each station, the linear regression of all 魏 values and epicentral distance, the 魏 value of intercept (魏 0) represents the 魏 value near the station, and the relationship between 魏 value and the average shear wave velocity (VS30) of 30 m and the average shear wave velocity (VSd) of the whole borehole depth is analyzed. 魏 0 decreases with the increase of average shear wave velocity, which is logarithmic, but its dispersion is larger. VS30 has a stronger ability to interpret 魏 0 than VSd.. Finally, this paper summarizes the main work, looks forward to the future work, and makes a preliminary discussion on a logic problem in the study of the attenuation relationship of ground motion.
【學(xué)位授予單位】：中國(guó)地震局工程力學(xué)研究所
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：P315.9
本文編號(hào)：2393318
[Abstract]:Many studies have shown that the acceleration Fourier amplitude spectrum will decrease rapidly in the high frequency band. Anderson and Hough have quantitatively studied the attenuation law of the acceleration Fourier spectrum above the corner frequency. The spectral attenuation parameter Kappa (魏) is used to describe this phenomenon. 魏 is widely used by seismologists and engineers in the field of engineering seismology, and is widely used in the work of source, earthquake simulation and attenuation. With the wide use of seismological methods, more and more scholars study and discuss the influencing factors and determining methods of 魏 value, and different scholars use different data to get different conclusions. The 魏 value may be associated with the source characteristics (magnitude and focal mechanism). The site condition and the way of transmission are related, but there is still no consistent conclusion. This paper focuses on the influencing factors of 魏 value. In the more than 30 years since 魏 was introduced into the field of engineering earthquake, different scholars have put forward different calculation methods, some of them are suitable for strong earthquakes, some are suitable for small and medium earthquakes, and some are suitable for microearthquakes. In this paper, a strong earthquake with magnitude 4. 5 is used. The classical AndersonHough method, the fixed stress drop calculation method and the wideband inversion method are used to calculate the 魏 value. In this paper, 151 KiK-net (surface and underground) and 189 K-NET stations of 512 earthquakes with magnitude greater than 4.5 between January 2011 and January 2014 were collected from northeast Japan (36 擄N-40 擄Nian 138 擄E-143 擄E). The effects of propagation path magnitude and local site characteristics on the 魏 values obtained by the above three methods are discussed. It is found that there is a linear relationship between 魏 value and epicentral distance, but the dispersion is larger. The 魏 value increases with the increase of distance, and the linear relationship between the results of KiK-net downhole data is the most obvious. For each earthquake, the 魏 value and epicentral distance of all stations are linear regression, and the 魏 value (魏 s) of intercept denotes the 魏 value near the epicenter. The linear regression relation is not significant, but the influence of magnitude is not significant. For each station, the linear regression of all 魏 values and epicentral distance, the 魏 value of intercept (魏 0) represents the 魏 value near the station, and the relationship between 魏 value and the average shear wave velocity (VS30) of 30 m and the average shear wave velocity (VSd) of the whole borehole depth is analyzed. 魏 0 decreases with the increase of average shear wave velocity, which is logarithmic, but its dispersion is larger. VS30 has a stronger ability to interpret 魏 0 than VSd.. Finally, this paper summarizes the main work, looks forward to the future work, and makes a preliminary discussion on a logic problem in the study of the attenuation relationship of ground motion.
【學(xué)位授予單位】：中國(guó)地震局工程力學(xué)研究所
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：P315.9
【相似文獻(xiàn)】
相關(guān)碩士學(xué)位論文 前1條
1 朱百慧;強(qiáng)震數(shù)據(jù)Kappa值影響因素的討論[D];中國(guó)地震局工程力學(xué)研究所;2016年
，本文編號(hào)：2393318
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