共查询到20条相似文献，搜索用时 140 毫秒
1.
《地震学报(英文版)》1998,(4)
ＴｈｅｐｈｙｓｉｃａｌｉｍｐｌｉｃａｔｉｏｎｏｆｃｏｄａａｍｐｌｉｔｕｄｅｒａｔｉｏａｎｄｉｔｓｐｏｓｓｉｂｌｅａｐｐｌｉｃａｔｉｏｎＴＩＡＮ－ＺＨＯＮＧＺＨＡＮＧ（张天中）ＹＵＮ－ＳＨＥＮＧＭＡ（马支生）ＲＯＮＧ－ＬＩＡＮＧＨＵＡＮＧ（黄蓉良）Ｉｎ... 相似文献
2.
Ａｓｉｎｇｌｅ－ｓｔａｔｉｏｎｃｏｄａｓｏｌｕｔｉｏｎｆｏｒｓｏｕｒｃｅ,ａｔｅｎｕａｔｉｏｎａｎｄｓｉｔｅｆａｃｔｏｒｓＴＩＡＮ－ＺＨＯＮＧＺＨＡＮＧ（张天中）ＹＵＮ－ＳＨＥＮＧＭＡ（马云生）ＲＯＮＧ－ＬＩＡＮＧＨＵＡＮＧ（黄蓉良）Ｉｎｓｔｉｔｕ... 相似文献
3.
ＵｐｐｅｒｍａｎｔｌｅｆｌｏｗｂｅｎｅａｔｈｔｈｅＮｏｒｔｈｗｅｓｔｏｆＣｈｉｎａａｎｄｉｔｓｌｉｔｈｏｓｐｈｅｒｉｃｄｙｎａｍｉｃｓＪＩＡＮ－ＨＵＡＨＵＡＮＧＩ（黄建华）；ＸＩＡ－ＨＵＡＣＨＡＮＧＩ（常筱华）ａｎｄＲＯＮＧ－ＳＨＡＮＦＵＩ傅容珊）（... 相似文献
4.
ＲｅｓｅａｒｃｈｏｎｉｎｖｅｒｓｉｏｎｏｆａｖｅｒａｇｅｓｔｒｅｓｆｉｅｌｄｂｙｇｅｎｅｔｉｃａｌｇｏｒｉｔｈｍｓＸＩＮＧ－ＸＩＮＤＵ（杜兴信）ＨＵＩ－ＬＩＮＧＺＨＡＮＧ（张惠玲）ＸＩＵ－ＬＩＮＧＬＵ（鲁秀玲）ＣＨＵＮ－ＳＨＥＮＧＺＨＡＮＧ（张春生... 相似文献
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Ｓｔｕｄｙｏｎｔｈｅｃｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆｃｒｕｓｔ┐ｍａｎｔｌｅｔｒａｎｓｉｔｉｏｎｚｏｎｅｉｎＷｅｓｔｅｒｎＹｕｎｎａｎＰｒｏｖｉｎｃｅＨＯＮＧ－ＸＩＡＮＧＨＵ（胡鸿翔）ＺＨＯＮＧ－ＹＡＮＧＬＩＮ（林中洋）ＹＩＮ－ＪＵＢＩＡＮ（边银... 相似文献
6.
ＴｈｅｍｅｃｈａｎｉｓｍｏｆｒｅｇｉｏｎａｌｇｒａｖｉｔｙｃｈａｎｇｅｓｂｅｆｏｒｅａｎｄａｆｔｅｒｔｈｅＴａｎｇｓｈａｎｅａｒｔｈｑｕａｋｅＲＵＩ－ＨＡＯＬＩ（李瑞浩）ＪＩＡＮ－ＬＩＡＮＧＨＵＡＮＧ（黄建梁）ＨＵＩＬＩ（李辉）ＤＯＮＧ－ＳＨＥＮＧ... 相似文献
7.
The synthetical elastic characteristic parameters of earth tide and its abnormal precursor evolution
《地震学报(英文版)》1998,(4)
ＴｈｅｓｙｎｔｈｅｔｉｃａｌｅｌａｓｔｉｃｃｈａｒａｃｔｅｒｉｓｔｉｃｐａｒａｍｅｔｅｒｓｏｆｅａｒｔｈｔｉｄｅａｎｄｉｔｓａｂｎｏｒｍａｌｐｒｅｃｕｒｓｏｒｅｖｏｌｕｔｉｏｎＹＡＮ－ＢＩＮＺＨＡＮＧ（张雁滨）ＪＵＮＪＩＡＮＧ（蒋骏）ＸＵ－ＤＯＮＧＬ... 相似文献
8.
ＡｎｅｗａｐｐｒｏａｃｈｔｏｎｕｍｅｒｉｃａｌｓｉｍｕｌａｔｉｏｎｏｆｓｏｕｒｃｅｄｅｖｅｌｏｐｍｅｎｔｏｆｅａｒｔｈｑｕａｋｅＣＨＵＮ－ＡＮＴＡＮＧ（唐春安）ＹＵ－ＦＡＮＧＦＵ（傅宇方）ＷＥＮＺＨＡＯ（赵文）ＣｅｎｔｅｒｆｏｒＲｏｃｋｂｕｒｓｔｓ... 相似文献
9.
Ｉｎｆｌｕｅｎｃｅｏｆｌｏｎｇｐｅｒｉｏｄｓｅｉｓｍｉｃｗａｖｅｓｉｎ┐ｄｕｃｅｄｂｙｔｈｅＴａｉｗａｎｌａｒｇｅｅａｒｔｈｑｕａｋｅｏｎＳｈａｎｇｈａｉａｒｅａＫＵＮ－ＹＵＡＮＺＨＵＡＮＧ（庄昆元）ＹＯＮＧ－ＬＩＮＸＵ（徐永林）ＪＩＡＮ－ＷＥＮＳ... 相似文献
10.
Ｓｅｉｓｍｉｃｓｏｕｒｃｅｒｕｐｔｕｒｅｓｏｆｓｅｖｅｒａｌｓｔｒｏｎｇｅａｒｔｈｑｕａｋｅｓｏｆ１９８９ｉｎＳｉｃｈｕａｎｒｅｇｉｏｎｏｆＣｈｉｎａＹＵＡＮＧＡＯ１）（高原）ＺＨＯＮＧ－ＬＩＡＮＧＷＵ２）（吴忠良）ＨＵＩ－ＬＡＮＺＨＯＵ３）（周... 相似文献
11.
Transformation between gravimetric and GPS/levelling-derived geoids using additional gravity information 总被引：1，自引：0，他引：1
The transformation from the gravimetric to the GPS/levelling-derived geoid using additional gravity information for the covariance function of geoid height differences has been investigated in a test area in south-western Canada. A “corrector surface” model, which accounts for datum inconsistencies, long-wavelength geoid errors, vertical network distortions and GPS errors, has been constructed using least-squares collocation. The local covariance function of geoid height differences is usually obtained from residual values between the GPS/levelling and gravimetric geoid heights after the elimination of all known systematic distortions. If additional gravity data (in the form of gravity anomalies) are available, the covariance function of geoid height differences can be determined by the following steps: (1) transforming the GPS/levelling-derived geoid heights into gravity anomalies; (2) forming differences between the computed in step 1 and given gravity anomalies; (3) determining the parameters of the local covariance function of the gravity anomaly differences; (4) constructing an analytical covariance model for the geoid height differences from the covariance function of the gravity anomaly differences using the parameters derived in step 3. The advantage of the proposed method stems from the great number of gravity data used to derive the empirical covariance function. A comparison with the least-squares adjustment shows that the standard deviation of the residuals of the predicted geoid height differences with respect to the control point values decreases by 2.4 cm. 相似文献
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13.
本文提出了位场区域-剩余异常分离的空间域递减半径迭代法.由给定半径的圆周上八点位场值的算术平均导出一个新的八点圆周平均公式,它是一个由重磁数据计算区域异常的滤波器.该滤波器的传递函数有一主瓣和多个旁瓣,且半径越大,旁瓣越多,滤波器特性越差.由从大到小不同半径对应的传递函数的连乘积构造了递减半径迭代传递函数,它以大半径为参变量.递减半径迭代传递函数类似低通滤波器,其截止波数与大半径成反比.由递减半径迭代传递函数,给出空间域分离区域异常的递减半径线性迭代法,由重磁数据减去区域异常求得剩余异常.进一步,通过构造非线性修正系数,把空间域递减半径线性迭代法中线性迭代公式变成非线性迭代公式,得到空间域递减半径非线性迭代法.重磁理论模型及安徽泥河铁矿重磁资料的试验表明,空间域递减半径非线性迭代法可有效地压制假异常和高频干扰以及减少异常畸变,并能有效地分离出区域异常和剩余异常. 相似文献
14.
依据航空重力测量基本原理,构建了航空重力异常解算的卡尔曼滤波模型,将新息自适应卡尔曼滤波器(IAE,Innovation based Adaptive Estimation)应用于量测噪声未知的航空重力异常解算.针对IAE滤波器滑动窗口宽度难以准确确定的问题,通过对多个不同滑动窗口新息协方差估计的加权平均,获得改进的IAE滤波器,该IAE滤波器不仅具有量测噪声自适应估计能力,还能实现滑动采样窗口的优化选取.试验结果表明,IAE滤波器可以降低因量测噪声统计信息不明引起的解算误差,改进IAE解算的重力异常误差约为1mGal. 相似文献
15.
Muhammad Sadiq Carl C. Tscherning Zulfiqar Ahmad 《Studia Geophysica et Geodaetica》2009,53(3):375-388
This paper deals with the analysis of gravity anomaly and precise levelling in conjunction with GPS-Levelling data for the
computation of a gravimetric geoid and an estimate of the height system bias parameter No for the vertical datum in Pakistan by means of least squares collocation technique. The long term objective is to obtain
a regional geoid (or quasi-geoid) modeling using a combination of local data with a high degree and order Earth gravity model
(EGM) and to determine a bias (if there is one) with respect to a global mean sea surface. An application of collocation with
the optimal covariance parameters has facilitated to achieve gravimetric height anomalies in a global geocentric datum. Residual
terrain modeling (RTM) technique has been used in combination with the EGM96 for the reduction and smoothing of the gravity
data. A value for the bias parameter No has been estimated with reference to the local GPS-Levelling datum that appears to be 0.705 m with 0.07 m mean square error.
The gravimetric height anomalies were compared with height anomalies obtained from GPS-Levelling stations using least square
collocation with and without bias adjustment. The bias adjustment minimizes the difference between the gravimetric height
anomalies with respect to residual GPS-Levelling data and the standard deviation of the differences drops from 35 cm to 2.6
cm. The results of this study suggest that No adjustment may be a good alternative for the fitting of the final gravimetric geoid as is generally done when using FFT methods. 相似文献
16.
Precise estimation of covariance parameters in least-squares collocation by restricted maximum likelihood 总被引：1，自引：0，他引：1
Precise estimates of the covariance parameters are essential in least-squares collocation (LSC) in the case of increased accuracy requirements. This paper implements restricted maximum likelihood (REML) method for the estimation of three covariance parameters in LSC with the Gauss-Markov second-order function (GM2), which is often used in interpolation of gravity anomalies. The estimates are then validated with the use of an independent technique, which has been often omitted in the previous works that are confined to covariance parameters errors based on the information matrix. The crossvalidation of REML estimates with the use of hold-out method (HO) helps in understanding of REML estimation errors. We analyzed in detail the global minimum of negative log-likelihood function (NLLF) in the estimation of covariance parameters, as well, as the accuracy of the estimates. We found that the correlation between covariance parameters may critically contribute to the errors of their estimation. It was also found that knowing some intrinsic properties of the covariance function may help in the scoring process. 相似文献
17.
The determination of the local gravity field by means of the point mass inversion method can be performed as an alternative to conventional numerical methods, such as the least-squares collocation. Based on the first derivative of the inverse-distance Newtonian potential for the representation of the gravity anomaly data, it is possible to compute any wavelength component of the geoid in planar approximation with sufficient accuracy. In order to exemplify the theoretical concept, two applications are presented of the computation of two different wavelength components of the geoid, the long wavelength component in a local solution and the short wavelength component in a regional solution. The results are compared with corresponding least-squares collocation solutions, using a global geopotential model to remove and to restore the long wavelength component. 相似文献
18.
A multi-subwaveform parametric retracker of the radar satellite altimetric waveform and recovery of gravity anomalies over coastal oceans 总被引：3，自引：0，他引：3
HWANG CheinWay 《中国科学:地球科学(英文版)》2010,(4)
The quality of satellite radar altimetric data is very important in studies of geodesy,geophysics,and oceanography.Over coastal oceans,altimeter waveforms are contaminated by the terrain and physical environments so that the accuracy of altimeter data is lower than that over open oceans.Here we develop a new multi-subwaveform parametric retracker(MSPR) to improve the quality of altimeter data for the recovery of gravity anomaly in coastal oceans.The least squares collocation method is used to recover the residual gravity anomaly over the coastal water from altimetric data.The waveform data records from Geosat/GM around Taiwan Island are practically retracked with MSPR.When compared with the Taiwan geoid height,the results retracked by MSPR are more accurate than those retracked by the well-known β-5-parmeter method and from the geophysical data records(GDRs).The gravity anomalies over Taiwan coastal waters are calculated from the retracked altimeter data with the least squares collocation.When we compared gravity anomalies computed using altimeter GDRs with the ship-borne gravity data over Taiwan coastal ocean,we found that the results from retracked data are more accurate than those from GDRs. 相似文献
19.
利用重力异常反演测试三维地震波速度结构,存在解不唯一、可靠性不高的问题。将面波反演充分融合到重力异常反演方程中,降低传统反演方法的非唯一性,并提升可靠性。以川滇地区为例,采用融合后的重力异常反演方法分析三维地震波速度结构。通过速度和密度的关系转换,得到对应的重力异常数据。由于面波频射数据主要对地震波横波速度敏感,因此将重力异常数据和初始横波速度相连,依据地震波速度和岩石密度之间的关系,获取重力异常反演方程,用于分析速度结构。选取21.6°~34.2°N、97.1°~105.9°E范围内的川滇地区活动块体作为实验数据,经过实验分析发现：使用该方法迭代反演川滇地区地壳上地幔顶部横波速度,重力异常数据和面波频射数据的残差值分别是6.24 mGal和0.027 km/s,实际拟合效果较好;分析该地区不同深度切面横波速度发现,在24 km深度处,上地壳中含有相对低速层,在44 km深度处,中下地壳中存在低速层;且该方法分析川滇地区三维地震波速度结构解的分辨率较高。 相似文献
20.
Gravity data inversion can provide valuable information on the structure of the underlying distribution of mass. The solution of the inversion of gravity data is an ill-posed problem, and many methods have been proposed for solving it using various systematic techniques. The method proposed here is a new approach based on the collocation principle, derived from the Wiener filtering and prediction theory. The natural multiplicity of the solution of the inverse gravimetric problem can be overcome only by assuming a substantially simplified model, in this case a two-layer model, i.e. with one separation surface and one density contrast only. The presence of gravity disturbance and/or outliers in the upper layer is also taken into account. The basic idea of the method is to propagate the covariance structure of the depth function of the separation surface to the covariance structure of the gravity field measured on a reference plane. This can be done since the gravity field produced by the layers is a functional (linearized) of the depth. Furthermore, in this approach, it is possible to obtain the variance of the estimation error which indicates the precision of the computed solution. The method has proved to be effective on simulated data, fulfilling the a priori hypotheses. In real cases which display the required statistical homogeneity, good preliminary solutions, useful for a further quantitative interpretation, have also been derived. A case study is discussed. 相似文献