Penggunaan Alat Seismik Refraksi

Summary

This video script provides an overview of a virtual field trip for physics students, where they engage in seismic refraction data collection. Due to restrictions, the data collection is demonstrated by teaching assistants, guiding students through the process. The script details the setup of equipment like geophones, cables, and triggers, along with software usage for seismic data acquisition. The process involves testing geophones, setting frequencies, and collecting data via seismic waves, all while ensuring proper equipment handling and data saving. The aim is to teach students the practicalities of seismic refraction in an interactive and accessible way.

Takeaways

• 😀 The session is a virtual field trip for seismic refraction data collection in a physics practical session.
• 😀 Due to limitations, the data collection cannot be done directly by the students, but will be represented by assistants.
• 😀 The equipment used for seismic data collection includes a hammer, geophones, cables, and a software system.
• 😀 Cables need to be set up carefully to prevent damage, with connectors spaced 2 meters apart for a total length of 48 meters.
• 😀 Each geophone is connected to a cable that is carefully positioned and connected to the operator's device.
• 😀 Geophones are installed into the ground every 2 meters and have two cables—red for larger connections and black for smaller ones.
• 😀 The cables need to be connected with the correct polarity, ensuring the black cable goes into the smaller connector and the red cable into the larger one.
• 😀 The software system used is Estinet, where geophone connections are tested, and data acquisition is managed.
• 😀 The software interface allows users to configure the seismic settings, including adjusting frequency and time for optimal data capture.
• 😀 After data is acquired, it can be saved in a specified folder, and files are easily accessed through file explorer for further review.

Q & A

What is the purpose of the seismic refraction field trip discussed in the video?

The purpose of the seismic refraction field trip is to collect data for a physics practical session. This data collection involves using specific equipment to measure seismic waves and their refraction as part of a virtual field trip experience.

Why can't the data collection be done directly on-site during this session?

The data collection cannot be done directly on-site because of the current circumstances, likely due to restrictions or other external factors. Instead, the process is demonstrated virtually by the assistants.

What are the main tools and equipment used for seismic refraction data collection?

The main tools include a hammer (for striking), geophones (for detecting seismic waves), cables (for connecting the geophones), and a software program called 'Estinet' for data processing and acquisition.

How are the geophones installed during the data collection process?

The geophones are installed by placing them on the ground, spaced 2 meters apart. They are secured into the ground using stakes, and the geophone's cables are connected to connectors, with the red cable being attached to a larger connector and the black cable to a smaller connector.

What is the significance of connecting the geophones with the correct cables?

Correctly connecting the geophones with the proper cables ensures that the data is accurately recorded. The red and black cables correspond to different connectors, with the red cable going to a larger connector and the black cable to a smaller one, ensuring proper signal flow.

How does the Estinet software contribute to the data collection process?

Estinet software is used to test the geophones, display the data from them, and control the acquisition process. The software helps in monitoring the geophones' connectivity and adjusting the frequency and timing for data acquisition.

What does the process of 'testing geophones' in Estinet software entail?

In Estinet, the geophone testing involves checking if all 24 geophones are correctly installed and recognized by the software. This is done by clicking 'go to geophone test' and ensuring the software registers all the geophones connected to the system.

What is the role of the hammer in the seismic refraction data collection?

The hammer is used to create seismic waves by striking the ground. These waves are then detected by the geophones, and the data from their reflections is used to analyze the subsurface properties.

How is the seismic wave data saved and accessed during the session?

The seismic wave data is saved by clicking 'save acquisition' and browsing to select a folder for storage. The files are then accessible through file explorer, where the saved data can be reviewed.

What are the potential risks when connecting the cables, and how can they be avoided?

One potential risk is pinching fingers when connecting the cables, especially when handling the connectors. To avoid this, users are advised to handle the cables carefully and avoid placing their fingers between the connectors.