The point of origin of an earthquake is known as the focus. So, the correct answer is d. focus.

Here's a step-by-step explanation:

1. An earthquake begins deep within the Earth at a location called the focus or hypocenter. This is the actual location where the seismic event originates and energy is released.

2. The seismic waves, which are the energy waves that travel through the Earth after the earthquake, originate from the focus.

3. The epicenter is the point on the Earth's surface directly above the focus. This is often the location reported when an earthquake occurs, as it's the most directly affected area.

4. The term "principal" doesn't have a specific meaning

Question

The point of origin of an earthquake is known as the focus. So, the correct answer is d. focus.

Here's a step-by-step explanation:

1. An earthquake begins deep within the Earth at a location called the focus or hypocenter. This is the actual location where the seismic event originates and energy is released.

2. The seismic waves, which are the energy waves that travel through the Earth after the earthquake, originate from the focus.

3. The epicenter is the point on the Earth's surface directly above the focus. This is often the location reported when an earthquake occurs, as it's the most directly affected area.

4. The term "principal" doesn't have a specific meaning

Knowee AI · Accepted Answer

The point of origin of an earthquake is known as the focus. So, the correct answer is d. focus.

Here's a step-by-step explanation:

1. An earthquake begins deep within the Earth at a location called the focus or hypocenter. This is the actual location where the seismic event originates and energy is released.

2. The seismic waves, which are the energy waves that travel through the Earth after the earthquake, originate from the focus.

3. The epicenter is the point on the Earth's surface directly above the focus. This is often the location reported when an earthquake occurs, as it's the most directly affected area.

4. The term "principal" doesn't have a specific meaning

The point of origion of earthquake isa.principalb.seismic wavesc.epicenterd.focus

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