BY JOHN V. WEHAUSEN and EDMUND V. LAITONE l With 56 Figures. • Surface waves are larger in amplitude and longer in duration than body waves. Among the many types of seismic waves, one can make a broad distinction between body waves, which travel through the Earth, and surface waves, which travel at the Earth's surface. Much of the motivation for joint inversion derives from two factors. /PTEX.InfoDict 51 0 R x���P(�� ��endstream Body waves can propagate into the interior of the corresponding medium, whereas surface waves are concentrated along the surface of the medium. Free Surface Water Waves z x y y=h(x,y,t) or F(x,y,z,t) = 0 B(x,y,z,t) = 0 Figure 1. /FormType 1 Body waves Introduction P- and S-waves are referred to as body waves because they are transmitted through the volume (or body) of the material, as apposed to travelling along the surface. /R7 53 0 R /BBox [0.00000000 0.00000000 129.00000000 53.00000000] persion characteristics of surface waves contained in strong motion data. %���� specific energy density of surface and body waves in a medium containing a homogeneous distribution of point scatterers. /Contents 19 0 R forward and back-scattered surface waves; and (3) body-to-surface scattered waves (Figure 1). /R8 52 0 R fRi6g���ߤ�!�j J�.O��ʈR�� 50 0 obj << /MediaBox [0 0 362.8347 272.1261] When an earthquake occurs, some of the energy it releases is turned into heat within the earth. /Type /Page Multiscale adjoint waveform tomography for surface and body waves Yanhua O. Yuan 1, Frederik J. Simons , and Ebru Bozdağ2 ABSTRACT We have developed a wavelet-multiscale adjoint scheme for the elastic full-waveform inversion of seismic data, including body waves (BWs) and surface waves (SWs). : 48–50: 56–57 Other modes of wave propagation exist than those described in this article; though of comparatively minor importance for earth-borne waves, they are important in the case of asteroseismology. /ProcSet [ /PDF ] /Shading << /Sh << /ShadingType 3 /ColorSpace /DeviceRGB /Domain [0.0 3.99998] /Coords [3.99998 3.99998 0.0 3.99998 3.99998 3.99998] /Function << /FunctionType 3 /Domain [0.0 3.99998] /Functions [ << /FunctionType 2 /Domain [0.0 3.99998] /C0 [0.4375 0.375 0.3125] /C1 [0.875 0.75 0.625] /N 1 >> ] /Bounds [] /Encode [0 1 ] >> /Extend [true false] >> >> endobj ���q���vm�x��oP�k�]�n\Ť�6��|ǯv��އ�Miќiٰ�(��`��5J'��~�J �فyn��������^�?ص_ff;������ N�5����"#̾tZ�m�JØ�$�vd��YQ��V���nh�E��aaqc�s=��v S� �E�B�riA�yN�$�� ������]��4��Ri5���sV��?�� j�ȟk�v&e���װ3:d8�'�ہ���LH2drLh����i�"w�=�ТL�&�E�;�(�ߤ��!Zjy�V�P�Ty�bI�AL�a���T �`҃�yg�%�O7�{��9�'�i ��v���F�Z��v��F��b0��D�B�(�u��W��� ����N��B �Z���ЁCg��+X`�$� o_�߁n��Gw�ĤÙ�PM�3�C��'l!6���+H�q^��-�g4�llxr�%�M�[캧B�V �A��Yoe���p.�ȥ�Gހ�m�TS4����l�o���4������-��|_��y�xG� �e��!�7����Tk��垩�֢ �3@|�3��>�"�{" /Parent 46 0 R As they spread out, they alternately push (compress) and pull (expand) the ground as they move through it. x� endstream These waves cause shaking that is felt, and cause damage in various ways. /ExtGState << Earthquakes radiate seismic energy as both body and surface waves. 9 0 obj << Thereby, waves do appear in various forms and differ in their characteristics. 1 0 obj /Length 15 19 0 obj << Unlike body waves, surface waves are strongly dispersed in the Earth, having phase and group velocities that depend on frequency. endobj ��5�Z!YV�,U��;��d&�_�@�Azxx���33��o��{��� ���篷��?�����o�}��z����-���x�i|�>�[�c��~����������������������_�ߎ/��*}���y�s�����yh��^�p#��_�g��m����|ϓeW��b����7��R��vy/-}�r����7��VF���w�;�+(3���|��|�y\���^���Aw��뼑7�5u�=o�����/��^��K��͏��J9�{;#��0�ϓ����8_��c��@[#O.f��v=/�3�\�z"���W��o������r�sȥ}�yM1��Q{�!c{z�V����g���7���>����c�F�>62�9�ӽ��8�Θü�*�'�N��o�9`s�w����1�\��C_b+7�/��������`�@��8�yc���ہ1��y��|�������G��lp�$��Zϴ�9�u���g�9ͳG��8[��2���v>�vB�ٽ=��8+L��Q�;6�5�n���@�?�l�cF�����덽���������s��g��U�ٲ)5̩Չ��c��Г+O0��u��C¢΋���3��\�s>y�ɜ�`?py.~�o؈���?��*@݁���t�ֵ����s��ɸ��,���J���(�4 �wO#���V���꿾��0J:K?���/�w����������3���3�z�,�:�Y�. ) body-to-surface scattered waves ( Figure 1 ) period seismic waves and shear or secondary ( )! 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