2023 Global Seismic Event Overview
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Questions and Answers

What triggered the nine-day seismic event in 2023?

  • A meteor impact in the Greenland ice sheet
  • A volcanic eruption near the Dickson Fjord
  • A large landslide and subsequent tsunami (correct)
  • A massive earthquake in the Pacific Ocean

    • What was unique about the seismic readings from the 2023 event?

  • The readings lasted for several days, unlike typical, short earthquake signals.
  • The readings indicated a continuous wave pattern, unlike the typical sharp spike of an earthquake. (correct)
  • The readings indicated a series of smaller earthquakes occurring in rapid succession.
  • The readings were extremely strong, exceeding any previous recorded earthquake.

    • What is the approximate volume of rock and ice that fell into the Dickson Fjord?

  • 3,300 million cubic meters
  • 33 million cubic meters (correct)
  • 330 million cubic meters
  • 3.3 million cubic meters

    • What was the approximate height of the tsunami caused by the landslide?

    <p>198 meters (D)</p> Signup and view all the answers

    What scientific technique was used to understand the wave's behavior in the fjord?

    <p>Sonar survey (A)</p> Signup and view all the answers

    What type of wave was created by the back-and-forth movement of the tsunami in the fjord?

    <p>A seiche (B)</p> Signup and view all the answers

    What aspect of the fjord contributed to the sustained shaking of the Earth?

    <p>The narrowness of the fjord (D)</p> Signup and view all the answers

    What is the approximate distance of the landslide site from the open ocean?

    <p>200 km (D)</p> Signup and view all the answers

    Flashcards

    Seismic Signal

    A wave generated by earthquakes or related phenomena detected by sensors.

    Dickson Fjord

    A fjord in East Greenland where the 2023 landslide occurred.

    Landslide

    The collapse of a mass of rock and earth down a slope, contributing to seismic activity.

    Mega-tsunami

    A massive wave caused by geological events, here created by a landslide.

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    Seiche

    A standing wave in an enclosed body of water, caused by the energy concentration of waves.

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    Energy Concentration

    The focus of energy, in this case, within the fjord due to the tsunami.

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    Standing Wave

    A wave that oscillates in place without traveling, vibrating back and forth.

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    Global Seismology

    The study of seismic waves and their effects on a global scale.

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    Study Notes

    2023 Global Seismic Event Explained

    • A nine-day global seismic event, characterized by a slow, constant wave, puzzled scientists in September 2023.
    • An international team of 68 scientists linked the event to a massive landslide and tsunami in East Greenland's Dickson Fjord.
    • The landslide, occurring on September 16, 2023, involved the collapse of a mountain and glacier, releasing approximately 33 million cubic yards of rock and ice.
    • The resulting 650-foot-tall tsunami was among the highest recently recorded.
    • High-resolution sonar surveys by the Danish Navy revealed a standing wave phenomenon (seiche) within the fjord.
    • The confined space of the narrow fjord trapped the tsunami energy, causing it to resonate and shake the Earth for nine days.
    • The phenomenon is comparable to water sloshing in a bathtub or pool, but on a much larger scale.
    • The landslide is believed to be triggered by rising temperatures in Greenland, which melted the supporting glacier.
    • This event is considered a novel instance of climate change impacting the Earth's crust globally.
    • Findings were published in the September 2024 issue of Science.

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    Description

    Explore the extraordinary nine-day seismic event of September 2023 caused by a massive landslide and tsunami in East Greenland. This quiz covers the scientific findings related to the phenomenon, the impressive tsunami height, and how rising temperatures played a crucial role. Test your knowledge about this fascinating natural disaster and its implications.

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