The Zhaotong-Ludian Fault zone, composed mainly of three right-step en echelon faults, namely, the Zhaotong-Ludian Fault, the Sayuhe Fault and the Longshu Fault, strikes 40°～60° on the whole, with the Sayuhe Fault and the Longshu Fault dipping SE and the Zhaotong-Ludian Fault dipping NW, and they all together constitute a complicated thrust fault system. Based on years of field investigation results of geology and geomorphography, we elaborate the late Quaternary active features, the geological and geomorphic evidences of the latest activity of the Zhaotong-Ludian Faults. Our observation shows that: the late Cenozoic basins along the Zhaotong-Luian Fault zone are obviously dominated by the fault; there are many neo-active fault landforms, such as, flat and straight fault troughs, directional aligned fault facets and fault scarps, and the upper Pleistocene to Holocene strata are offset by the fault. The fault zone has been active since the late Quaternary. For example, the fault at Daqiaobian dislocated a set of strata of the Pliocene, and middle to upper Pleistocene, with an apparently reverse character. The fault trending NE is developed in the Holocene diluvium with oblique striation on the fault plane at Guangming Village. Deposits with an OSL age of(23.4±1.8)ka BP on T2 terrace of a small river near Beizha town was offset by the fault. There is a fault scarp trending NE 40°, 0.5～2.0m in height, on the first terrace of the Longshu River near the Longshu Village. Several Quaternary faults are revealed by the trench which offset the late Pleistocene to Holocene strata and there are three poleo-earthquake events discovered in the trench. At Yanjiao Village the gravel layer has risen steeply and is aligned in a line because of squeezing effect of the fault; the rivers and ridges nearby are synchronously offset dextrally up to 30～40m. The fault zone is dominated by reverse faulting with a small amount of right-lateral motion. Besides, there are some NW-trending faults interweaving with the NE-trending fault zone, some of which are active since late Quaternary as well, and they are the conjugate structures with the NE-trending faults. Surface deformation, such as NE- and NW-trending ground fissures and reverse scarp landforms, has been generated in the epicenter area of the 2014 Ludian M 6.5 earthquake, the distribution of which is in consistence with the NE- and NW-trending faults. Because of far-field deformation response and energy exchange and transfer between blocks, the Liangshan active sub-block formed on the east of the Sichuan-Yunnan block, and the Zhaotong-Ludian Fault zone lies in the forefront of the SE movement of this sub-block. On account of its distinct location and its complicated geometric structure, the Zhaotong-Ludian Fault zone is one of main carriers of the tectonic deformation of the Liangshan active sub-block to absorb and accommodate the strains produced by the block's SE movement, and is the southern boundary of the Liangshan sub-block. From the point of view of the regional tectonic positions and the kinematic characteristics, the relation of Zhaotong-Ludian Fault zone to the Liangshan active sub-block is exactly as the relation of the Longmanshan Faults to Bayan Har block. Consequently, the Zhaotong-Ludian Fault zone has an important significance in the division of active block boundaries and the regional tectonic framework, and meanwhile, it is also an important seismogenic structure in the northeastern Yunnan.

昭通-鲁甸断裂带主要由昭通-鲁甸、洒渔河和龙树3条右阶斜列的断裂组成.总体走向40°～60°, 洒渔河和龙树断裂倾向SE, 昭通-鲁甸断裂倾向NW, 它们共同构成几何结构复杂的逆冲断裂系.野外考察表明:沿断裂表现为平直的断层槽地、定向排列的断层三角面、断层陡坎等地貌;大桥边、北闸镇、光明村等地断错了晚更新世—全新世地层;龙树河Ⅰ级阶地上发育高0.5～2.0m的断层陡坎.表明其最新活动时代为晚更新世—全新世, 运动性质以逆冲运动为主兼有右旋走滑分量.此外, 在NE向断裂间穿插发育的一些NW向断裂, 同样表现出晚第四纪活动特征.在2014年鲁甸 M 6.5地震震区产生了NE和NW向地裂缝和地形反坎等地表形变, 与NE和NW向断裂展布基本一致, 反映了断裂的新活动特征.由于块体远程变形响应与能量交换传递, 在川滇块体东侧形成了凉山次级活动块体, 昭通-鲁甸断裂带位于凉山次级活动块体SE向运动的前缘部位.它独特的地理位置和复杂的断裂几何结构成为凉山次级块体构造变形的主要承载体之一, 吸收、调节块体SE向运动应变, 并构成了凉山次级活动块体的南部边界.从区域构造部位和运动特征分析, 昭通-鲁甸断裂带之于凉山次级块体, 正如龙门山断裂带之于巴颜喀拉块体.昭通-鲁甸断裂带在活动块体边界和区域构造格架划分上具有重要的构造意义, 同时也是滇东北地区重要的地震构造.

In general,the displacement produced by a magnitude 6～7 earthquake is relatively small,even does not reach the surface,so it is difficult to be preserved in geological records. On the other hand,the seismogenic fault of such earthquakes is easy to be considered incorrectly as a non-active fault since Holocene,consequently overlooking the real seismic hazard in the future. To solve this problem,we propose a type of faults that are capable of generating M 6～7 earthquakes,but with weak surface activity and cannot produce conspicuous surface displacement. To recognize such faults from geological records,which have no visible evidence of activity since middle-late Pleistocene,is the key to intermediate-and long-term earthquake prediction. The specific procedures of the technology are as follows: First,we determine the seismotectonic setting of the tectonic system in which the target fault lies. Second,we establish the relation between the target fault and other active faults in the same tectonic system,which have records of historical earthquakes or paleoearthquakes. Then we compare varied seismogenic units in the same-order structure,same tectonic system,and varied stages in the same tectonic process. The case studies demonstrate that this is an effective method for intermediate-and long-term earthquake prediction. The cases studied include the Puduhe-Xishan Fault in Kunming City,Hanzhong Basin in the north section of the Longmen Shan Fault zone,Dachuan-Shuangshi Fault in the south section of the Longmen Shan Fault zone,and the Guguan-Guoshun Fault of the Longxian-Baoji Fault zone. These faults all show weak activities on the surface and have potential for earthquakes with estimated magnitude 6.5～7.0.In addition,by estimation using this method,the Taoyuan-Guichuan Fault of the Longxian-Baoji Fault zone has a seismic risk of M 6.0～6.5 earthquake,and the Longxian-Qima-Mazhao Fault is capable of producing an earthquake about M 7.5.

6～7级地震地表位错量往往很小甚至不断错地表,其发震断裂很容易被误判为非全新世活动断裂而导致其未来强震危险性被忽视。对此,文中特提出未来可能发生6～7级地震的地表弱活动断裂类型。甄别地表弱活动断裂是6～7级地震中长期预测技术的关键,技术要点是: 在目标断裂所属构造系统的发震能力判定基础上,构建起目标断裂与同一构造背景中具历史地震记载或古地震地质记录的活动断裂之间的某种联系。实际案例解析结果表明,同一级次相似构造、同一构造系统不同孕震构造单元,以及特定构造过程中不同阶段构造级次的类比,是地表弱活动断裂6～7级地震中长期预测较为有效的技术方法。昆明市普渡河-西山断裂、龙门山断裂带北段汉中盆地活动构造系和南段大川-双石断裂为地表弱活动断裂,潜在震级6.5～7.0,陇县-宝鸡断裂带的桃园-龟川寺、固关-虢镇以及陇县-岐山-马召断裂潜在震级依次为6.0～6.5、6.5～7.0、7.5级左右。

In this paper, Sichuan-Yunnan and its adjacent areas are divided into Yajiang, Central Yunnan, Sichuan-Qinghai, Central Sichuan, and Myitkyina-West Yunnan blocks. The mode and rates of motion of these blocks and their boundaries are studied separately. The predominant direction of the principal compressive stress axes within the blocks is analyzed in term of focal mechanism solutions of 442 moderate strong earthquakes. The models of focal faulting are determined through the rake angles λ obtained from source parameters of 771 events with magnitudes about 3 or more, and they are evidenced by focal faulting or slip modes derived from the distributions of N axis plunges of P-wave first motion solutions for moderate-strong earthquakes. A comparison is made between the moment tensor rates for moderate-strong earthquake and the calculated annual average slip rates of each seismotectonic zones within the blocks. Based on regular resurveying of across fault short level lines and baselines during the period of 1980-2001 along the border of the Sichuan-Qinghai, Yajiang and Central Yunnan blocks, the annual average rates of horizontal and vertical deformation for each site are analyzed. The motion rates of the Sichuan-Yunnan Block are inhomogeneous. The Sichuan-Qinghai Block moves toward SEE direction, and the predominant direction of the principal compressive stress axis falls in the range of N100°～130°E. The motion rate of this block is smaller than that of the Yajiang block, implying a delayed motion relative to that of the later. As a result, the Xianshuihe Fault between these two blocks displays a strong left lateral displacement. In addition to earthquakes of strike-slip type, the earthquakes of reverse dip-slip type are also predominant in the Sichuan-Qinghai Block. The predominant direction of the principal compressive stress axes in the Yajiang Block is within the range of N160°～170°E, i.e. SSE. The motion rate of this block is larger than that of the Sichuan-Qinghai Block, and the percentage of strike-slip type earthquakes in this block is larger then that in the other blocks. The motion direction of the Central Yunnan Block is nearly the same as that of the Yajiang Block, leaning slightly to the east. The predominant direction of the principal compressive stress axes in this block is in the range of N150°～160°E, and there are various types of earthquake failure including strike-slip, normal dip-slip, and reverse dip-slip. The direction of the principal compressive stress axes in the Central Sichuan Block falls in the range of N110°～140°E, approximately the same as the motion direction of the South China Block. The percentage of strike-slip type events in this block is relatively low, and there is a portion of events belonging to normal dip-slip or oblique dip-slip types. The motion rates at the northeast boundary between the Yajiang and Central Yunnan Blocks are greater than those at the west and south boundaries. The SSE-directed motion of the blocks is associated with right lateral component. Similarly, as the motion rates of the eastern boundary of the Sichuan-Qinghai Block is greater than that of the Longmenshan belt to the southeast of the block, the SSE-directed motion of the Sichuan-Qinghai Block is also associated with right lateral component. Two predominant directions of the principal compressive stress axes in the Myitkyina-West Yunnan Block indicate the NE-directed squeezing and the SE-directed escaping of the block, while the motion rate of the block is larger than that of the Yajiang and Central Yunnan Blocks. This might be attributed to the dynamic mechanism of the formation of collision and squeezing belts due to the direct action of the Asam Wedge while Indian Plate moving northward.

用442次中强地震的震源机制解分析了川滇次级地块应力场的优势方向.使用771次3级左右地震的滑动角λ参数统计确定震源断层的错动方式,并用中强地震P波初动解的 N 轴仰角的统计分布结果得到的震源断层错动或滑动型式去佐证.拟合中强地震的矩张量速率式,计算了川滇次级地块各地震构造区的年均滑动速率,并进行比较.根据1980-2001年川青地块、雅江地块和滇中地块边界断裂带跨断层短水准、短基线定期复测结果,分析了水平和垂向年均形变速率.川滇地块间的运动是不均匀的.川青地块的运动方向为SEE.雅江地块压应力场优势方向为SSE,相对川青地块的运动速率更大.滇中地块承袭雅江地块的运动方向,略偏东.密支那滇西地块压应力场有2组优势方向,存在向NE方向的推挤和SSE方向的逃逸,活动速率大.

In this text, we firstly discussed the relationship between the water filling and seismicity in Longtan reservoir and found that the characteristic of reservoir induced seismicity was very apparent in Longtan reservoir and these epicenters mainly distributed in 5 clusters.Digital seismic data recorded by 24 fixed and temporary stations located around the reservoir were used to study the characteristics of anelastic attenuation in this region and to obtain the site responses. After that, source parameters of 1616 earthquakes with magnitude bigger than 0.1 were calculated and the differences existing in characteristics of source parameters between reservoir induced seismicity and tectonic earthquake were discussed. Our results show that (1) Seismicity in Longtan reservoir has strong relationship with the water filling of reservoir and the activity status of seismicity for these five clusters are various in different water filling period. The response of seismicity to the water filling process is affected by the development of local faulted structure and the water permeability of the rock. (2) Seismic moment M 0 increases with increasing magnitude M L in Longtan reservoir and their statistical relationship is Log M 0 =1.07 M L +10.17. Relationship between stress drop and magnitude is consistent with the result gained by Nuttli that intraplate earthquake follows the ISD model, with a statistical relationship LogΔ σ =0.71 M L －2.89. (3) Radiated seismic energy and apparent stress in Longtan reservoir all increase with increasing magnitude, indicating that the big earthquake is a radiator of seismic energy with more efficient rather than small earthquake. (4) In general, there are some differences in stress drop for different cluster. The distribution of stress drops has a good consistence with the water depth of reservoir, with high value of stress drop in deeper water depth. (5) Stress drops of reservoir induced seismicity are smaller than that of tectonic earthquake with same magnitude apparently, about 10 times. These results maybe indicate that the reservoir induced seismicity can occur with a lower tectonic stress due to the high hole pressure of the underground medium and the effect of the water lubrication.

首先讨论龙滩库区水库蓄水与地震活动之间的关系,发现龙滩水库诱发地震特征十分明显,地震共分5丛呈丛集分布.利用库区架设的24个固定和流动台站记录的数字记录资料,在研究得到龙滩库区非弹性衰减和台站场地响应的基础上,精确测定得到了该地区总共1616个 M L ≥0.1级地震的震源参数,比较了水库诱发地震与构造地震震源参数特征的差异,得到了以下主要结论:1)龙滩水库地震活动与水库蓄水关系密切,不同蓄水阶段5丛的地震活动状态不同,局部断裂构造发育以及岩石透水性能影响着地震活动对蓄水过程的响应.2)龙滩水库诱发地震的地震矩 M 0 随震级 M L 的增大而增大,两者之间存在较好的线性关系,统计关系为Log M 0 =1.07 M L +10.17. 应力降与地震大小之间的关系和Nuttli的板内地震为增加应力降(ISD)模型的结果比较吻合,统计关系为LogΔ σ =0.71 M L －2.89.3)龙滩水库地区地震辐射能量和地震视应力均随震级的增大而增大,后者意味着大地震是比小地震更高效率的地震能量辐射体.4)总体上不同丛地震应力降水平存在差异.地震应力降空间分布上与库水深度有较好的一致性,即库水深的区域应力降水平高.5)与同震级的构造地震相比,水库诱发地震的应力降值比前者明显偏低,大约小10倍.这可能是由于水库蓄水造成地下介质孔隙压力增大或者水的润滑作用,从而导致在一个比较低的构造应力情况下发生水库诱发地震.

Based on the analysis of the focal mechanism solutions of 51 earthquakes occur-ing in Southwestern China and geological data of 10 earthquake fault zones of the region, we discuss in this paper, division of the present tectonic stress field in Souh-western China into separate regions and their relation to the recent tectonic activity.It has been found that a tectonic block in the shape of an inclosed rhomb bounded by the Xianshuihe （鲜水河）, Anninghe （安宁河）, Xiaojiang （小江）, Qujiang （曲江） and Red River on the east, south and southwest, is moving southeastward relative to the surroundings. This rhmobic block controls the occurrence of most of the earthquakes in this area.

本文通过对我国西南地区以及相邻的越南、缅甸北部地区的51个地震的震源机制结果和10个地震破裂带资料的力学分析,讨论了我国西南地区现代构造应力场分区及现代构造活动特征。并得出由鲜水河断裂带、安宁河断裂带、小江断裂带、通海曲江断裂带和红河断裂带所围成的一个不封闭菱形地块相对外围区域有向南南东移动的趋势。此菱形地块控制着我国西南地区的主要地震活动。

Because of the special geographical location and complex tectonic background of the Chuan-Dian rhombic block and its adjacent areas, researches on the tectonic stress and fault mechanics of the region have been a concern for scientists, recently. Focal mechanism solutions and focal depths of 75 M ≥3.5 moderate earthquakes occurring in the Chuan-Dian rhombic block and its adjacent regions from Aug. 1st, 2007 to Apr.21th, 2013 are obtained by using CAP method. Combining the results with the historical focal mechanism solutions from Harvard CMT, the characteristics of the spatial distribution of the focal mechanisms and focal depths are investigated, and their tectonodynamic background is discussed. Main conclusions are drawn as follows. 1)The spatial distributions of focal mechanisms differ among different faults and sub-blocks inside the block and those outside the block, which indicate the heterogeneity of the regional stress filed. 2)Spatial distribution of focal mechanisms is consistent with the tectonic background, suggesting that the recent faulting and earthquake mechanisms of the Chuan-Dian rhombic block and its adjacent regions are controlled mainly by the faulting of respective fault zones and the interaction between sub-blocks. 3)The special features of focal mechanisms, P axis and T axis distribution in the Lijiang-Xiaojinhe Fault zone further confirm the absorption and shielding effect of the fault on the plateau's escaping masses. 4)The predominant focal depth in the Chuan-Dian rhombic block and its adjacent region is 5 to 15km, suggesting that brittle seismic layer beneath the Chuan-Dian rhombic block is in the upper crust.

利用CAP（Cut and paste）方法获取了川滇块体及周边区域2007年8月至2013年4月75次3.5级以上中等地震的震源机制解，结合哈佛大学历史地震震源机制解，分析了震源机制解和震源深度的空间分布特征，并探讨了其构造动力学背景。结果表明：1）川滇块体各不同断裂带、块体内部各次级块体之间、块体内外表现出不同的震源机制解空间分布特征，揭示出位于青藏高原东南缘的川滇块体及周边地区应力场的非均匀性；2）研究区各主要断裂带所反映的与构造背景作用一致的震源机制分布特征表明，川滇块体及周边近期断层破裂方式主要受到各个断裂带的构造活动以及次级块体之间相互作用的控制；3）丽江-小金河断裂带上特殊的震源机制特征和发震应力轴的分布特征，进一步证实了丽江-小金河断裂带对高原逃逸物质的抵挡和屏蔽的作用；4）震源深度分布特征表明，川滇块体及周边地震震源深度主要分布于15km的上地壳，优势分布在5～15km的范围，揭示出研究区的地壳脆性孕震层位于5～15km的上地壳。

The earthquake sequences within sixteen days of the Ludian M(s)6.5 earthquake in Yunnan province are relocated by double difference algorithm. The relocation results show that the mainshock is located at 27.11 degrees N, 103.350 degrees E and the focal depth is about 15 km; the earthquake sequences are distributed dominantly "L"-shaped in the SSE and EW direction, and show nearly vertical focal depth distribution, indicating it is a strike-slip earthquake and has two rupture planes in different directions. Although the Ludian M(s)6.5 earthquake occurs near the NE-directed Zhaotong fault and its back thrust faults (Longshu fault and Dayandong fault), these faults are thrust faults and cannot be the seismogenic fault. This earthquake occurs in the junction region where multiple faults are distributed in radial pattern; the SSE-directed rupture branch has coincident strike with the Baogu' nao fault, while the nearly EW-directed rupture branch has coincident strike with the south part of the Xiaohe fault. The Ludian M(s)6.5 earthquake may have connected the Baoguinao fault and the Xiaohe fault in depth.

本文采用双差定位方法对云南鲁甸 M S 6.5地震震后16天的地震序列进行重定位研究.重定位结果显示，主震位于27.11°N，103.35°E，震源深度约15 km；地震序列主要呈“L”形优势分布，分为SSE向和近EW向两支，并均呈现近垂直的震源分布特征，显示此次地震为走滑型，并存在两个不同方向的破裂面.虽然此次地震发生于NE向昭通断裂及其反冲断裂（龙树断裂、大岩洞断裂）附近，但这些断裂均为逆冲型断裂，被排除了作为发震断裂的可能性；鲁甸地震发生在呈放射性分布的多条断裂的交汇部位，SSE向破裂分支与包谷垴断裂的方向一致，近EW向破裂分支与小河断裂南端的走向一致. 鲁甸地震可能已将包谷垴断裂和小河断裂在深部贯通.

The NE-trending Zhaotong and Lianfeng fault zones of the eastern Sichuan-Yunnan border region are poorly studied on earthquake issues. To know whether the two fault zones have seismic potential for strong and major earthquakes, we make a comprehensive study by integrating multidisciplinary data of active tectonics and regional dynamics, distribution of relocated small earthquakes and focal mechanism solutions, historical earthquake rupture-areas, GPS deformation field, modern seismicity and its parameter patterns, etc. Our study shows that the Zhaotong and Lianfeng fault zones are a part of the boundary separating the Sichuan-Yunnan block and the South China block, and also the margin between the active and deformed secondary faulted block of Daliangshan and the relatively stable South China block. Structurally, the fault zones appear as two parallel and southeastward thrusting fault zones with the currently right-lateral strike-slip faulting along with significant thrusting components. Along the Zhaotong fault zone the time without major earthquakes is proved to have been over 1700 years at least, and a seismic gap exists there. The GPS deformation patterns suggest that the Zhaotong and Lianfeng fault zones have locked in different degrees. Also, several areas of low b-values or high stress exist on the Zhaotong fault zone near Ludian and on the southern segment of the Lianfeng fault zone. A locked or highly stressed fault segment of the Zhaotong fault zone between Ludian and Yiliang has been identified from low b-values and lack of current small earthquakes, and the moment magnitude for a maximum potential event on this fault segment is estimated to be about M(w)7. 4. We therefore conclude that mid- to long-term seismic potential for strong or major earthquakes exists on the Zhaotong fault zone. But, the seismic potential of the Lianfeng fault zone still needs to be studied further.

川滇交界东段NE向昭通、莲峰断裂带的研究程度较低.为了了解该断裂带是否存在发生强震/大地震的危险背景,我们基于区域活动构造与动力学、重新定位的小震分布和震源机制解、历史地震破裂区、GPS形变场、现代地震活动及其参数图像等多学科的信息进行综合研究.结果表明:昭通、莲峰断裂带是川滇-华南活动块体/地块边界带的一部分,也是活动及变形的大凉山次级块体与相对稳定的华南地块之间的边界带;结构上表现为2个平行展布、朝南东推覆的断裂带,现今运动为带有显著逆冲分量的右旋走滑性质.沿昭通断裂带无大地震的时间至少为1700 余年,目前存在地震空区.GPS变形图像反映昭通、莲峰断裂带已不同程度闭锁.另外,昭通断裂带的鲁甸附近以及莲峰断裂带的南段分别存在异常低 b 值区或高应力区.已由低 b 值区和小震空白区识别出昭通断裂带上的鲁甸—彝良之间存在高应力闭锁段,并估计出其潜在地震的最大矩震级为 M W 7.4.本研究因此认为昭通断裂带存在发生强震/大地震的中-长期危险背景, 而莲峰断裂带的危险性还需进一步研究.

The orientations of the mean principal stress axes in eastern part of Qing-Zang plateau and Yunnan area are deduced from first P-wave polarity readings of microearthquakes, which occurred in this region during the period of 1975 to 1984. The result indicates that, while both P （compressional） and T （tensional） axes are horizontal, their azimuths show a tendency of rather regular rotation from a NE-SW compression in the north, then E-W in the middle part, to a NNW-SSE or nearly N-S compression in the southern part. This pattern of stress axis directions may be attributed to the joint action of the northward push of the India plate to the Qing-Zang plateau and the southwestward pull of the sinking material in the Burma intermediate-depth seismic zone to the Yunnan area.

本文根据1975—1984年期间发生的多个小地震的P波初动方向数据,推断了青、甘、川、滇地区平均主应力轴的方向。结果表明,该地区压应力轴（P轴）和张应力轴（T轴）方向皆水平,但其方位由北到南呈现规则转动的趋势,即主压应力轴在北部青甘地区大致取NE—SW方向,到中部川西北地区转为近E—W方向,再到南部云南地区转为NNW—SSE或近N—S方向。形成应力轴方向这样特定分布图象的原因,可用印度板块向北对青藏高原的推挤和缅甸中源地震带地区下沉物质对云南地区的拖曳作用来解释。

An inversion technique for focal mechanisms of local and regional earthquakes, named Generalized Polarity and Amplitude Technique (GPAT), is proposed based on the progress already made over decades, and its feasibility and capability of resisting disturbance are tested by a series of numerical experiments. At first, an inversion equation system is constructed with the vectors consisting of the polarities of the P first motion and the maximal amplitudes of generalized phases based on the concept of wave field, and a technique for solving the equation system is specified. Then, a series of experiments are conducted for the effect of various factors on inversion results, including distribution of observation stations, number of the stations, random noises, errors in epicenter location, errors in focal depth and errors in velocity model. Finally, a special experiment is designed for comprehensive effect of all the factors. The experiments suggest that the GPAT is feasible, and has rather good capability of resisting disturbance. It must be stressed that the error in velocity model has the strongest effect on inversion result compared with other factors.

基于数十年来已有的研究进展，提出了一种地方和区域地震震源机制反演技术——广义极性振幅技术（GPAT），并通过一系列数值实验检验了这种技术的可行性和抗干扰能力.首先，从地震波场概念出发，利用P波初动极性与广义震相振幅构建矢量，建立反演系统，并给出求解技术；然后，考虑影响反演结果的各种因素，包括台站布局、台站数目、随机噪声、震中位置误差、震源深度误差和速度模型误差，分别进行了单一因素影响测试；最后，同时考虑各种因素进行了综合测试.实验结果表明，GPAT是可行的，具有良好的抗干扰能力.需要强调的是，在众多影响因素中，速度模型误差对反演结果的影响最大.