Application of GMT in Seismological Emergency Technology Products——Drawing of Stress Field Map
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摘要: 针对目前地应力符号绘制困难、地应力图加工与发布依赖于人工编辑等问题，提出使用GMT自定义符号技术设计符合地学界通用符号标准的应力符号，给出利用GMT绘制地应力图的整体流程，最终实现了地应力数据矢量和应力状态信息的准确表达，并帮助用户简化地应力图绘制程序、提高信息报送的时效性。以龙门山区域应力分布为例，多方位对比国内外制图方法。结果表明，使用GMT自定义符号技术设计的应力符号不仅简化了地应力图的绘制程序，且表达出的应力数据信息更丰富。该技术已应用于《震后趋势判定技术系统》中，并在地震趋势会商工作中发挥重要作用。Abstract: In view of the current difficulty of geo-stress symbol drawing, and the operation of geo-stress depends on manual editing, it is proposed to use the custom symbol technology of GMT to design stress symbols that meet the standards in the geosciences, and the whole process drawing stress map by GMT is given, and the accurate expression of stress data and stress regime information is realized. In this way, it helps users to simplify the procedures in drawing maps and improve the efficiency of information reporting. By studying the drawing of the stress distribution map of Longmen mountain area, we compare with domestic and foreign drawing methods in many ways. The results show that the stress symbols designed by custom symbol technology in this paper not only simplify the drawing process, but also enrich the stress data information. This paper has applied the results of the mapping to Post-earthquake trend determination technology system, which played an important role in seismic trend conference.
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Key words:
- GMT software /
- Longmen mountain stress area /
- Custom symbol technology /
- Automatic output
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图 4 具有方向、质量、应力状态信息的应力指标震源机制解符号
Figure 4. Symbols of seismic mechanism with direction, data quality, stress state information
图 5 基于GMT软件绘制的龙门山应力区应力场分布
Figure 5. Distribution of stress field in Longmen mountain stress zone based on GMT software
图 6 传统方式绘制的龙门山应力区应力场分布
Figure 6. Distribution of stress field in Longmen mountain stress zone by traditional methods
图 7 基于CASMO可视化工具绘制的龙门山应力区应力场分布
Figure 7. Distribution of stress field in Longmen mountain stress zone based on CASMO visualization tool
图 8 CASMO在线绘制地应力图首页
Figure 8. The website homepage of CASMO used drawing stress map online
表 1 自定义符号语言中可用的部分绘图命令
Table 1. Some drawing commands available in symbolic languages
名称 代码 目的 参数 旋转 R 旋转坐标系 ${\rm{ \mathsf{ α} [a]}}$ 圆形 c 画圆 $ \rm{x}，\rm{y}，\rm{size}$ 菱形 d 画菱形 $ \rm{x}，\rm{y}，\rm{size}$ 六边形 h 画六边形 $ \rm{x}，\rm{y}，\rm{size}$ 倒三角形 i 画倒三角形 $ \rm{x}，\rm{y}，\rm{size}$ 文字 l 添加文字 $ \rm{x}，\rm{y}，\rm{string}$ 绘制矩形 r 绘制矩形 $ \rm{x}，\rm{y}，\rm{windth}，\rm{heigth}$ 正方形 s 绘制正方形 $ \rm{x}，\rm{y}，\rm{size}$ 正三角形 t 绘制正三角形 $ \rm{x}，\rm{y}，\rm{size}$ 十字架 x 绘制一个十字架 $ \rm{x}，\rm{y}，\rm{size}$ x轴上的线段 - 在x轴上绘制线段 $ \rm{x}，\rm{y}，\rm{size}$ y轴上的线段 y 在y轴上绘制线段 $ \rm{x}，\rm{y}，\rm{size}$ 
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表 2 应力数据
Table 2. Stress data
LAT LON TYPE REGIME S1AZ 32.500 104.3 FMS TS 108 C 31.500 104.0 FMS TF 116 C 31.155 103.7 BO TF 121 C … … … … … …
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表 3 龙门山应力区断层类型统计
Table 3. Statistic of fault types in Longmen mountain stress area
项目 正断层 逆断层 走滑断层 不确定型 断层数目（条） 12 113 105 1 占总断层数目百分比（%） 5% 49% 45% 1%
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