Analysing the propagation of stress waves in heterogeneous geomaterials with internal reflections and non-linearity as well as in granular materials is central to geophysics. Recently new observations and theoretical concepts were introduced that point out to the limitations of the traditional concept. These are:
• Multiscale nature of waves in geomaterials
• Existence of non-reflective waves in the atmosphere and the ocean and the theoretically discovered continuously inhomogeneous media capable of transmitting elastic waves without reflection.
• Indications of slow transmission of disturbances with velocities in the neighborhood of 1000 km/year
• Evidence of the presence and propagation of rotational waves in geomaterials
• Strong rock and rock mass non-linearity (such as bilinear stress-strain curve with high modulus in compression and low in tension) and its effect on wave propagation
• The presence of apparent negative stiffness associated with rotation of non-spherical constituents and its effect on wave propagation
• Active nature of geomaterials (such as seismic emission induced by stress and pressure wave propagation)

Complex waves are now a key problem of the physical oceanography and atmosphere physics. They are called rogue or freak waves. It may be expected that similar waves are also present in non-linear solids (e.g., granular materials), which suggests the existence of new types of seismic waves.

It is anticipated that studying these and related phenomena can lead to breakthroughs in understanding of the stress transfer and multiscale failure processes in the Earth's crust, ocean and atmosphere and facilitate developing better prediction and monitoring methods.

The session is designed as a forum for discussing these and relevant topics.

Convener: Arcady Dyskin | Co-conveners: Elena Pasternak, Efim Pelinovsky, Sergey Turuntaev
| Fri, 12 Apr, 16:15–18:00
Room M1
| Attendance Fri, 12 Apr, 10:45–12:30
Hall X4

Attendance time: Friday, 12 April 2019, 10:45–12:30 | Hall X4

Chairperson: Serge Shapiro
X4.315 |
| Highlight
Vasily Riga and Sergey Turuntaev
X4.316 |
Mariia Trimonova, Sergey Turuntaev, Evgeniy Zenchenko, and Petr Zenchenko
X4.317 |
Nikolay Baryshnikov, Evgeny Zenchenko, and Sergey Turuntaev
X4.318 |
Elena Tobisch, Efim Pelinovsky, Tatiana Talipova, Ekaterina Didenkulova, and Arcady Dyskin
X4.319 |
Rui Xiang Wong, Elena Pasternak, and Arcady Dyskin
X4.320 |
| Highlight
Yuan Xu, Junxian He, Elena Pasternak, and Arcady Dyskin
X4.321 |
Elena Pasternak and Arcady Dyskin
X4.323 |
Arcady Dyskin and Elena Pasternak
X4.325 |
Maria Kuznetsova, Elena Pasternak, and Arcady Dyskin
X4.326 |
Arcady Dyskin and Elena Pasternak