Vibration accompanying an earthquake

Options

A. seismic waves
B. tremor
C. fault
D. moment

Answer

To answer the question regarding the vibration accompanying an earthquake, we need to analyze the options provided and understand the terminology related to earthquakes.

### Step-by-Step Solution:

1. **Understanding Earthquakes**:
- An earthquake is a sudden shaking of the ground caused by the movement of tectonic plates beneath the Earth's surface.

2. **Identifying the Terms**:
- The options given are:
1. Seismic waves
2. Tremor
3. Fault
4. Moment

3. **Analyzing Each Option**:
- **Seismic Waves**: These are waves of energy that travel through the Earth and are produced by the sudden release of energy during an earthquake. While they are related to earthquakes, they do not specifically refer to the vibrations felt during the event.
- **Tremor**: This term refers to the shaking or vibration that is felt during an earthquake. It is the sensation that people experience when the ground shakes.
- **Fault**: A fault is a fracture in the Earth's crust where blocks of land have moved relative to each other. While faults are related to earthquakes, they do not describe the vibrations themselves.
- **Moment**: This term typically refers to the seismic moment, which is a measure of the size of an earthquake. It does not refer to the vibrations felt during the event.

4. **Selecting the Correct Option**:
- Based on the analysis, the term that specifically describes the vibrations accompanying an earthquake is **Tremor**. Therefore, the correct answer is option 2: **Tremor**.

### Final Answer:
The vibration accompanying an earthquake is called a **Tremor**.