Download Elastic Wave Propagation and Generation in Seismology by Jose Pujol PDF

By Jose Pujol

Bridging the distance among introductory textbooks and complex monographs, this booklet presents the mandatory mathematical instruments to take on seismological difficulties and demonstrates the way to practice them. together with pupil routines, for which ideas can be found on a devoted site, it appeals to complicated undergraduate and graduate scholars. it's also an invaluable reference quantity for researchers wishing to "brush up" on basics prior to they examine extra complex subject matters in seismology.

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Extra resources for Elastic Wave Propagation and Generation in Seismology

Sample text

45) 132 = 321 = 213 = −1. 46) The permutation symbol is also known as the alternating or Levi-Civita symbol. 44) is general in the sense that it can be extended to more than three subindices. 47) i jk =  −1, if i jk are not in cyclic order. Three different indices i jk are in cyclic order if they are equal to 123 or 231 or 312. They are not in cyclic order if they are equal to 132 or 321 or 213 (see Fig. 4). The permutation symbol will play an important role in the applications below, so its properties must be understood well.

27) To show that si jk is a tensor proceed as before si jk = ti j u k = ail a jm tlm akn u n = ail a jm akn tlm u n = ail a jm akn slmn . 28) As another example, the outer product of two vectors a and b is the tensor with components ai b j . This particular outer product will be considered again when discussing dyadics. (4) Contraction of indices. In a tensor of order two or higher, set two indices equal to each other. As the two contracted indices become dummy indices, they indicate a sum over the repeated index.

Can be 1, 2, 3. 12) to tensors of order n is obvious. For example, for a third-order tensor we have the following relations: ti jk = ail a jm akn tlmn ; tmnp = aim a jn akp ti jk . 14a,b) The definition of tensors can be extended to include vectors and scalars, which can be considered as tensors of orders one and zero, respectively. The corresponding number of free indices are one and zero, but this does not mean that dummy indices are not allowed (such as in t j j and u i,i , introduced below).

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