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Four different kinds of water treatment were applied to examine the photosynthetic characteristics of baldcypress (Taxodium distichum) seedlings in the hydro-fluctuation belt of the Three Gorges Reservoir area.
      
distichum takes on the features of a water-tolerant and hydrophilic plant, which can be considered as one of the species for the building of a forest protection system for the hydro-fluctuation belt in the Three Gorges Reservoir area.
      
Effects of reforestation on the hydrological function of a small watershed in the Three Gorges Reservoir Area
      
Four different kinds of water treatments were applied to study the photosynthetic eco-physiological characteristics of Taxodium ascendens seedlings in the environment of the Three Gorges hydro-fluctuation belt.
      
To establish a protection forest system in the hydro-fluctuation belt in the Three Gorges Reservoir Area, the species T.
      
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After the filling up of the Xinfengjiang Reservoir, Guangdong Province, seismi-eity was greatly increased. The majority of earthquakes occurred in the deep water gorge close to the dam, concentrated within a north-west belt. They are of shallow focal depths. A strong earthquake with magnitude 6.1 took place on March 19, 1962, about two and a half years since the impounding of the reservoir.According to the results of analysis of data from geodetic leveling and the spectra of seismic waves, the fault parameters...

After the filling up of the Xinfengjiang Reservoir, Guangdong Province, seismi-eity was greatly increased. The majority of earthquakes occurred in the deep water gorge close to the dam, concentrated within a north-west belt. They are of shallow focal depths. A strong earthquake with magnitude 6.1 took place on March 19, 1962, about two and a half years since the impounding of the reservoir.According to the results of analysis of data from geodetic leveling and the spectra of seismic waves, the fault parameters of the main shock were determined. The fault plane solutions of 150 small earthquakes, occurring within a period of 18 months before and after the main shock have been obtained from the amplitudes of the first motion of P wave. The directions of the earthquake generating stress of about 2000 small earthquakes were determined by smoothing the first motion patterns. Displacement field and stress field in the rock bodies underneath the reservoir caused by the load-ing of the reservoir water have been calculated.. Variations of the velocity ratio of the P and S waves prior to the main shock and several strong aftershocks were ana-lysed.In consideration of the seismicity as well as the geological background, we endeavour to discuss the cause of reservoir impounding earthquakes at Xinfengjiang. We have the opinion that the penetration of water along fissures becomes the most important factor causing the main shock of March 19, 1962 at Xinfengjiang.

广东省新丰江水库蓄水后地震活动性有很大增高,大部分地震发生在大坝附近的深水峡谷区,形成一条北西方向的密集带,震源深度极浅,随后,在蓄水后约二年半于1962年3月19日发生了6.1级强地震。 根据水准测量与地震波波谱资料的分析确定了主震的断层参数;用P波初动振幅确定了主震前后18个月内150次小地震的断层面解,用平滑P波初动图案求得了2000余次小地震的发震应力方向;计算了水库荷载在库基岩体中产生的位移场和应力场;分析了主震及其几个大余震前的地震纵波与横波的速度比变化情况。 结合地震活动性和地质背景初步讨论了新丰江水库地震的诱发机制,认为:水的渗透作用是诱发这次地震的主要原因。

An earthquake of M = 6.1 occurred in the Sinfengkiang Reservoir region, Kwan-tung Province on March 19, 1962. This paper analyses the variations of the velocity ratio Vp/Vs during the 14 years subsequent to 1961, in particular within the interval immediately prior to and following the main shock. The results show that before the main shock a negative anomaly of the velocity ratio VP/VS appeared. It lasted about 11 months. The velocity ratio returned to its normal value about 11/2 months in ahead of the main...

An earthquake of M = 6.1 occurred in the Sinfengkiang Reservoir region, Kwan-tung Province on March 19, 1962. This paper analyses the variations of the velocity ratio Vp/Vs during the 14 years subsequent to 1961, in particular within the interval immediately prior to and following the main shock. The results show that before the main shock a negative anomaly of the velocity ratio VP/VS appeared. It lasted about 11 months. The velocity ratio returned to its normal value about 11/2 months in ahead of the main shock. The amplitude of the negative anomaly becomes a maximum in a locality near the epicenter of the main shock within a deep-water gorge. It can be seen that the duration and the spatial extent of the velocity ratio anomaly is smaller than those of an ordinary non-reservoir impounding earthquake.Before some of the after shocks occurring in the later part of the 14-year period, anomalies in velocity ratio are also observed. The virtual velocity too shows anomalous features before the main shock. All of these facts thus mentioned could possibly be explained by the dilatancy model.The method for calculating the values of VP/Vs is taken from M. Ohtake's paper and that for the virtual velocity has been worked out by the author.

广东省新丰江水库区于1962年3月19日发生6.1级地震。本文分析了1961年以来十四年间,特别是主震前后纵、横波速比V_p/V_s的变化过程。结果表明:波速比V_p/V_s在主震前出现了明显的负异常,总异常时间约为十一个月,于震前一个半月返回正常值,在主震震源附近的深水峡谷区异常幅度最大,异常时间和空间范围比一般构造地震的要小.后期几次强余震前也有异常变化。虚波速度在主震前存在某些异常特征。上述波速比的变化可以用扩容模式较好地解释。 波速比值是由两个台站的记录得到的。对虚波速度的计算采用了联合地震参数的方法。

The paleolatitude of the Nantuo (南沱) sandstone of lower sinian in the Earstern Gorge Region of the Yangtze River was determined to be 74.5°-72.1°, and that of the Nantuo tillite was 86°. Thus, this region was situated at high latitude at the time when the rock was formed. The Nantuo tillite is considered to be represeutative of the polar glacial deposits wide spread in the continent.

用古地磁学方法测定长江峡东地区下震旦系南沱砂岩的古纬度是74.5°—72.1°,南沱冰碛岩的古纬度是86°。所以,在岩石形成时期这些地区是高纬度地带,南沱冰碛层应是代表当时广布大陆的极地型冰川沉积。

 
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