Final Project

DONET

Maira Azhar

What is DONET?

• Dense Oceanfloor Network System for Earthquakes and Tsunamis

• network of underwater observatories in Japan designed to detect earthquakes and tsunamis in real-time

History

• DONET was developed by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
• The initial stages of DONET's deployment began around the early 2000s
• It was the 2011 Tohoku earthquake and tsunami that emphasized the need for an advanced warning system
• Japan had already started though due to Tokyo's frequent earthquakes, frequent because Tokyo lies on 4 techtonic plates

Location

• Located in the south coast of Honshu, Japan
• tectonic plates it lies on are :

• Pacific
• North American
• Eurasion
• Filipino

Description: Components

• DONET stations are deployed around nodes, to which they are linked with optical fiber cables. Each node is similarly linked to a backbone cable.
• Seafloor Sensors: Include strong motion seismometers, collect temperature, pressure and other data
• Strong motion seismographs: instruments designed to record the details of very strong ground motions
• Communication Nodes: Connect sensors to fiber-optic cables
• Fiber-Optic Cables: Transmit data from seafloor to land-based stations

Description: Process

• Detection: Seafloor sensors detect seismic activity and pressure changes.
• Data Transmission: Data is sent via fiber-optic cables to communication nodes and then to land stations.
• Analysis: Real-time data is analyzed to identify potential tsunamis and earthquakes.
• Warning: Alerts are issued to relevant authorities and the public

Influencing Technology

Seismometers:

• Advanced seafloor seismometers are used to detect and measure seismic waves generated by earthquakes. These sensors are crucial for identifying the magnitude and location of seismic events
• A seismometer captures how much and how fast the ground is shaking by comparing the motion of a suspended mass to the ground.

Importance

• Early Detection of Earthquakes and Tsunamis: early warning can help initiate timely evacuation

• Enhanced Warning System: authorities can issue more precise and timely warnings

• Scientific Research: Can help the study of earthquake mechanisms, tsunami's, and ocean dynamics

• Global Impact: International collaboration and shared knowledge contribute to improved disaster resilience worldwide

Challenges

Emergency Repairs:

Long-term Funding:

Harsh Conditions:

Addressing unexpected damages caused by natural events (e.g., underwater landslides, extreme weather) can be costly and logistically complex

Ensuring sustained funding from government and private sources to support ongoing operations, maintenance, and upgrades

Designing equipment that can endure extreme pressures, low temperatures, and corrosive seawater found at the ocean floor

Impacts

Environmental Impact

Economic Impacts

Societal Impacts

Improved Natural Disaster Response:

• Tsunami Detection: DONET helps detect tsunamis early, allowing for timely warnings and reducing the environmental damage these waves can cause to coastal ecosystems.
• Seismic Monitoring: By providing detailed data on seismic activity, it aids in understanding earthquake dynamics, which can help in planning and protecting natural habitats from quake-induced changes.

• Early warnings allow for timely evacuations and protective measures for infrastructure, which significantly reduces the economic damage caused by earthquakes and tsunamis.
• Maintaining and upgrading DONET requires substantial funding, which can be a financial burden. However, the investment is justified by the potential savings

• The system provides early warnings for earthquakes and tsunamis, giving people time to evacuate and seek safety, thereby saving lives.
• With better information, communities can improve their preparedness and resilience against natural disasters, leading to fewer casualties and less panic during events

References

“DONET DONET II and S Net Cable Configurations.” Washington.edu, 2015, www.cev.washington.edu/file/DONET_DONET_II_and_S_Net_Cable_Configurations.html. Accessed 18 June 2024. Nakano, M, et al. “Ocean Floor Networks Capture Low-Frequency Earthquake Event.” Eos, Eos, 25 May 2016, eos.org/science-updates/ocean-floor-networks-capture-low-frequency-earthquake-event. Accessed 14 June 2024. Plaza Homes Ltd. “Japan and Earthquakes: Why They Happen and How to Scale Them - PLAZA HOMES.” PLAZA HOMES, 2024, https://www.realestate-tokyo.com/living-in-tokyo/emergency-disaster/earthquake-scale/#:~:text=Japan%20and%20earthquakes%20go%20hand,and%20the%20Philippine%20Sea%20Plate . Accessed 13 June 2024.Saffer, D, and A Kopf. “Site C0010.” Iodp.org, 2017, publications.iodp.org/proceedings/365/103/365_103.html. Accessed 15 June 2024. ‌ ‌

Tip:

Interactivity is the key to capturing the interest and attention of your audience. A genially is interactive because your audience explores and interacts with it.