"Earthquake" PPT

Description

Hunan Education Edition Sixth Grade Science Volume 1, Earthquake PPT

Part One: Experiment and Feel the Vibration

feel the vibration

experiment one

Work in pairs and pull one end of the paper in opposite directions until the paper breaks.

Experiment 2

Work in pairs, each holding one end of a chopstick and bending it until it breaks.

Understanding earthquakes

Earthquakes are caused by vibrations caused by cracks in rock layers in the earth's crust.

Earthquakes occur every day on the earth, about 5 million times a year. About 50,000 of them can be felt by people; about 1,000 of them can cause damage; there are an average of more than a dozen major earthquakes of magnitude 7 or above a year.

Earthquake PPT, Part 2: Hazards of Earthquakes

Earthquake hazards

Our country is located at the junction of the world's two major seismic zones, the Eurasian seismic zone and the Pacific Rim seismic zone. Earthquakes are frequent and disasters are severe. Earthquakes in mainland my country are characterized by high frequency, wide distribution, shallow source, high intensity and high disaster rate. In the last century, there have been three strong earthquakes with a magnitude of 8.5 or above in the world, two of which occurred in my country. Two strong earthquakes that killed more than 200,000 people in the world also occurred in our country. Therefore, the earthquake disaster situation in our country is very serious.

In the Tangshan earthquake that occurred on July 28, 1976, more than 242,000 people died and more than 164,000 people were seriously injured.

The magnitude of the Tangshan earthquake was 7.8, and the epicenter intensity was 11 degrees. The earthquake occurred in a densely populated industrial area and occurred at 3:42:56 (Beijing time), just as people were sleeping. The earthquake department failed to issue a forecast in advance. For these reasons, the damage it causes is severe.

Earthquake PPT, Part 3: There are signs before the earthquake

There are signs before the earthquake

1. Groundwater anomalies.

Well water is a treasure, and the signs come early.

There is no rain, the quality is muddy, and there is water in wells due to drought.

The water level changes greatly and bubbles appear.

Some change color, some change taste.

2. Animal abnormalities: Animals have signs before earthquakes, so close monitoring is the most important.

The mules, horses, cattle and sheep do not enter the pen, the ducks do not enter the water, and the dogs bark wildly.

The mice moved and fled, and the pigeons were frightened and could not return to their nests.

Snakes come out of their holes in the ice and snow, and fish jump out of the water in fear.

Earthquake PPT, Part 4: Basic knowledge about earthquakes

Earthquake tips

my country divides earthquake intensity into 12 degrees:

3 degrees: A few people feel it and the instrument can record it;

4-5 degrees: Sleepers will wake up and the chandelier will swing;

6 degrees: the container fell over and the house was slightly damaged;

7-8 degrees: House damage, ground cracks;

9-10 degrees: Bridges and dams are damaged, houses collapse, and the ground is severely damaged;

11-12 degrees: devastating damage.

Earthquake PPT, Part 5: Buildings and Earthquake Prevention

Buildings and Earthquake Protection

Usually, the seismic reinforcement of houses should start from three aspects: strengthening the seismic strength and improving the stability and deformation capacity of the house structure.

The seismic fortification of buildings usually consists of three steps: determining seismic fortification requirements, seismic design, and seismic construction.

There are six measures for seismic reinforcement of construction projects: corner columns, buttress columns, ring beams, steel tie rods, supports and plywood walls.

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Update Time: 2024-11-21

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