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Peng, Zhigang

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    Shaking up Earth Science: Visual and Auditory Representations of Earthquake Interactions
    (Georgia Institute of Technology, 2012-06) Aiken, Chastity ; Simpson, David ; Kilb, Debi ; Shelly, David ; Peng, Zhigang ; Michael, Andy ; Enescu, Bogdan
    One earthquake can influence subsequent earthquakes. To demonstrate such earthquake interactions, seismologists have used in the past "snapshot" static images. Although statis images can, by themselves, convey basic visual information about the spatial distribution of earthquakes, adding auditory information could help to provide additional details on the temporal evolution of the earthquake sequences. Recently we have used standard tools like MATLAB and Quick Time Pro to produce animations with time-compressed sounds to demonstrate both immediate aftershocks and remotely triggered tremors related to the 2011 magnitude 9.0 Tohoku-Oki, Japan, earthquake. Here we show our development in this direction that includes multiple parameters of earthquakes and seismic waves to present the concept of earthquake triggering.
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    Mainshock and early aftershock recording of the 2011/02/21 Mw6.3 earthquake in Christchurch, New Zealand
    (Georgia Institute of Technology, 2011) Peng, Zhigang
    Below is the image and sound of the seismic recording at station HVSC (more than 1.5 g vertical acceleration) for the 2011/02/21 Mw6.3 New Zealand earthquake. This vertical seismogram is recorded by strong motion sensors only about 1 km distance from the epicenter. From the sound below, you can hear not only the mainshock like a train running towards you, but also many small pops that are early aftershocks immediately afterward. The data can be downloaded from the Center for Engineering Strong Motion Data website.
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    Structure, seismicity, and stress along the San Andreas Fault near SAFOD
    (Georgia Institute of Technology, 2011) Thurber, Clifford ; Peng, Zhigang
    The San Andreas Fault Observatory at Depth (SAFOD) has yielded significant new insights into the nature of the San Andreas fault (SAF). In particular, the recovery of ~ 40 meters of core containing two meters-thick zones of fault gouge and adjacent zones of damage and alteration provides a unique opportunity to characterize the physical and chemical properties of fault zone rocks from a depth where earthquakes occur, although these samples are interpreted to come from a creeping, not seismogenic, part of the fault (Hickman et al., 2007, 2008). We propose to improve our understanding of the context within which these fault zone samples existed in-situ by utilizing arrival times of fault zone head waves (FZHW's) and the associated direct-wave secondary arrivals (DWSA's) to (1) improve the seismic tomography image of the SAF at relatively fine scale, and (2) improve absolute location estimates for earthquakes in the region around SAFOD and in particular the drilling target earthquakes. These two tasks have interrelated goals. Primary among them is to characterize in detail the seismogenic structures on which the earthquakes near SAFOD occur and relate those structures to the borehole and core observations. There is a general consensus that the shallower of the two gouge zones is related to the fault strand along which the so-called "Hawaii" target earthquakes occur. Our improved absolute earthquake locations will either help support or refute this interpretation.
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