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The authors would like to thank Dr. Melkumyan very much for the comments and discussion on our paper (Ing and Wang, 2004a). Two errors were detected in our numerical calculation:1. The term 1 À k 2 e in the denominator of Eq. (66) was missed in our numerical calculation. The numerical results for t > b bg h in Fig. 6 will become correct if it is divided by 1 À k 2 e . 2. As k approaches the branch cuts of Q -(k), numerical evaluation of the function Q -(k) should be replaced by Q(k)/Q + (k), whereQðkÞ ¼ Q þ ðkÞQ À ðkÞ ¼ ÀaðkÞ½aðkÞ À k 2 e bðkÞ ð1 À k 2 e Þðk 2 À b 2 bg Þ ¼ ð1 þ k 2 e ÞaðkÞ aðkÞ þ k 2 e bðkÞ . Therefore, the values of the dynamic stress intensity factor, the dynamic electric displacement intensity factor and the dynamic energy release rate are not zero for t < bh. We agree the numerical results calculated by Dr. Melkumyan. Although Dr. Melkumyan proposed alternative solution forms of the dynamic stress intensity factor for 0 < t < bh and bh < t < b bg h, the procedure and the analytical results presented in our paper remain valid. 0020-7683/$ -see front matter Ó