What is Seismology: Definition and 11 Discussions

Seismology (; from Ancient Greek σεισμός (seismós) meaning "earthquake" and -λογία (-logía) meaning "study of") is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies. The field also includes studies of earthquake environmental effects such as tsunamis as well as diverse seismic sources such as volcanic, tectonic, glacial, fluvial, oceanic, atmospheric, and artificial processes such as explosions. A related field that uses geology to infer information regarding past earthquakes is paleoseismology. A recording of Earth motion as a function of time is called a seismogram. A seismologist is a scientist who does research in seismology.

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  1. davenn

    M7.6 Earthquake Off Tonga - 2023-05-10

    M 7.6 - 95 km WNW of Hihifo, Tonga 2023-05-10 16:02:00 (UTC) 15.600°S 174.608°W 210.1 km depth A decent event that maxed out my seismo for some minutes https://www.sydneystormcity.com/seismograms.htm As it will disappear off my seismo in around 20 hours ( from time of writing this) a screen...
  2. N

    Silence of Canadian Cities: COVID19 Lockdown and Seismic Vibrations

    On 11 March 2020, the World Health Organization (WHO) declared Coronavirus disease (COVID-19) as a pandemic. By then it had spread to at least 110 countries. The announcement made by WHO had a cascading effect. Cities, territories, and countries around the world ended up declaring states of...
  3. P

    Finding the height of a focus point via ray tracing @ Snell's Law

    So far all I can work out is that the angle of incidence of the outer two and inner two rays is zero degrees, however, I can't work out how to get started on the problem. I feel like I need to use vertical slowness rather than the normal snell's law since I'm working with a dZ rather than a dX...
  4. N

    Surface Rayleigh waves generation

    Good day, I do not fully understand the physical mechanism of formation of Rayleigh waves at the free surface. While their derivation is quite clear and obey free-boundary conditions, it is not clear their physical mechanism. Could you please correct me in my discussion. Incident P-wave can...
  5. davenn

    What Caused the Recent Earthquakes in the SW Pacific Region?

    Hi guys the last 24 hours has seen 3 large quakes in the SW Pacific area 6.5 central Solomon Isl. not far from Kirakira M 6.5 - 65km NW of Kirakira, Solomon Islands 6.9 southern Kermadec Isl. area M 6.9 - 61km SW of L'Esperance Rock, New Zealand 6.3 Loyalty Isl area E of New Caledonia M 6.3...
  6. S

    Seismology and oil exploration

    Having just read Scientific America's article on the Cascade fault, I wonder if Seismology/Earthquake monitoring sensors could be used to detect fossil fuel reserves and eliminate the use of air-gun blasting that is wreaking havoc on ocean life. Can the oil companies not use naturally occurring...
  7. Remixex

    Stress and Strain tensors in cylindrical coordinates

    Homework Statement I am following a textbook "Seismic Wave Propagation in Stratified Media" by Kennet, I was greeted by the fact that he decided to use cylindrical coordinates to compute the Stress and Strain tensor, so given these two relations, that I believed to be constitutive given an...
  8. P

    Identifying the End of a Rayleigh Wave Train on Seismograms

    How can you tell where a dispersed Rayleigh wave train ends...? Is there a way to identify the end of a Rayleigh wave train on the following teleseismic records? The first shows the full surface wave train, the second is zoomed in but cuts off the final part of the original including the last...
  9. N

    Applied Seismology ebook _ finding

    Hello everyone, I'm finding Applied Seismology (a comprehensive guide to seismic theory and application) ebook of Mamdouh R. Gadallah... Please help me... I'm really appreciate about that... Thank you and wish all have nice time!
  10. P

    Discovering Seismology: Understanding Earth's Tremors

    What's Seismology?:rolleyes:
  11. M

    Java C or Java for Seismology Equipment: What's Best

    I may be taking control of the running of some seismology equipment, which is run via C code. I know very very little about C code. Would it be better for me to spend the time to thoughroughly learn C, or could it be possible for me to convert the software to Java. I have a pretty god...