Frequency-dependent attenuation of P and S waves in Yunnan region

Abstract

We analyzed digital seismogram data of 5 668 earthquakes that occurred in Yunnan region between July of 1999 and December of 2003. Among the 22 seismic stations, six ones, namely Baoshan, Yongsheng, Lijiang, Heqing, Yimen, and Luquan, were selected and their attenuations of P and S waves were measured by using the extended coda-normalization method. The six stations were classified into three regions according to their location, that is, Baoshan area, Yongsheng-Lijiang-Heqing (YLH) area and Luquan-Yimen (LY) area. The values of Qs 1 and Q~,I are expressed as Qs 1 = 0.008 67f -0.86 , Qp1 = 0.01 i 55f -°93 , Qs I = 0.018 24f ~'94 , Q~l = 0.022 88f -°91 , and Qs I = 0.016 47f ~'91 , Q~I = 0.028 26f -°'97 in Baoshan, YLH, LY areas respectively. The attenuation of YLH, LYare closer to each other, however, Baoshan area is apparently lower. Comparing attenuation in the three areas with other areas of the world using the same method, it is suggested that the attenuations of P and S waves in YLH and LY areas are close to Kanto of Japan, but much higher than southeast of South Korea. The Qs ~ and Q~I in Baoshan area are slightly higher than southeastern South Korea. Furthermore, the results indicate that our Qs ~ in Yunnan area is close to others by analyzing the coda attenuation.

Role of Intermetallics and Copper in the Deposition of ZrO2Conversion Coatings on AA6014

“…Such coatings are either deposited on the surface by sol-gel chemistry, or by immersion into a fluoric acidic of Zr/Ti. Nanoceramic coatings have been shown to provide good multi-metal corrosion protection for various substrates including steel, zinc, and Al alloys, [11][12][13][14][15][16][17] and combine good corrosion performance with excellent adhesion properties. 5,[18][19][20][21][22] A lot of work has been specifically focused on investigation of zirconium or titanium based pretreatment on Al alloys.…”

Multi-Soliton Excitations and Chaotic Patterns for the (2+1)-Dimensional Breaking-Soliton System

“…Figure 2 shows an evolutional profile corresponding to the physical quantity V expressed by (11) Figure 2 and through detailed analysis, we find that the shapes, amplitudes, and velocities of the two multi-dromion-solitoffs are completely conserved after their interactions.…”

“…Figure 5a shows a plot of the special chaotic pattern for the field V expressed by (11) with the condition (19) at time t = 0. In order to show that the chaotic behaviour is due to the peak value of solitons, we enlarge small regions (x ∈ [10,11], y ∈ [10, 11]) of Figure 5a. The result is shown in Figure 5b, which presents a kind of dromion with a chaotic structure clearly.…”

Ab Initio Molecular Dynamics Simulations of Cu under Vacuum and 473~1573K

“…In order to improve the processing parameters of the vacuum evaporation condensation preparation of ultra-fine copper powder, in this paper, molecular dynamics(MD) method was employed to simulate the melting process. During the past few decades, many similar researches focused on the microstructure transient process of the Cu metal melting [7][8][9][10][11][12]. In this paper, the simulation for Cu melting was performed by ab initio molecular dynamics simulation under the vacuum (10 Pa).…”