A house built on solid rock will shake more during an earthquake than a house built on sandy soil. . Steps to Earthquake Safety (p. 71) 9.
Which is likely to experience more damage during earthquake a house built on solid rock or a nearby house built on soil riverbank?
Explanation: A home built on a soil river bank would be subjected to intense vibrations during an earthquake which also set up harmonics that amplify the vibrations. ... Homes built on solid rock will still transmit shock waves from the earthquake, but are not subjected to harmonics or liquefaction movement.
Does loose sand or solid rock cause more damage during an earthquake?
When an earthquake occurs an area of solid rock will shake, but soft or loose soils can effectively amplify the shaking of the ground and cause more damage to occur, as was the case in the Marina District of San Francisco during the 1989 Loma Prieta earthquake.
Which construction material is more vulnerable to shaking of the ground during an earthquakes?
Masonry buildings are brittle structures and one of the most vulnerable of the entire building stock under strong earthquake shaking. The large number of human fatalities in such constructions during the past earthquakes in India corroborates this.
What type of house can withstand an earthquake?
The results were promising: wooden houses made of log and lumber structures remained in place after the strongest earthquake. Wooden houses easily survived the strongest earthquake and minor cosmetic damage had been inflicted to them.
What is the impact of earthquakes on humans?
Earthquakes usually cause severe damage to urban centres , resulting in the loss of life and damage to homes and other infrastructure. Although risks are normally associated with cities, the effects on the rural sector and farming communities can be devastating.
Do small earthquakes prevent big ones?
Small earthquakes are helpful because they release pressure and prevent larger ones . The earthquake magnitude scale, introduced by Charles Richter in 1935, is logarithmic, which means that progressively bigger quakes are a lot bigger than smaller quakes.
What are the 5 effects of earthquakes?
The primary effects of earthquakes are ground shaking, ground rupture, landslides, tsunamis, and liquefaction . Fires are probably the single most important secondary effect of earthquakes.
Can an earthquake destroy the earth?
Strong earthquakes can be extremely dangerous . The earth’s shaking may cause landslides or even rupture the surface of the ground. When saturated loose soils lose their stiffness and form, liquefaction occurs, and the ground collapses like a liquid.
Why do soft underlying materials amplify ground shaking?
The main factor that causes such amplification is soft soils that form low-velocity layers near the Earth’s surface . These low-velocity layers trap energy, amplify all frequencies due to the decrease in seismic impedance, and preferentially amplify resonant frequencies.
What makes a house earthquake proof?
To withstand collapse, buildings need to redistribute the forces that travel through them during a seismic event . Shear walls, cross braces, diaphragms, and moment-resisting frames are central to reinforcing a building. ... Made of panels, these walls help a building keep its shape during movement.
What materials are used for earthquake proof buildings?
Wood and steel have more give than stucco, unreinforced concrete, or masonry, and they are favored materials for building in fault zones. Skyscrapers everywhere must be reinforced to withstand strong forces from high winds, but in quake zones, there are additional considerations.
What type of ground material shakes the most?
Soft soils such as sand tend to amplify the shaking compared with hard soils such as bedrock. In addition to being soft, sand can also undergo a “liquefaction process” during an earthquake.
Where is the safest place in a house during an earthquake?
COVER your head and neck (and your entire body if possible) underneath a sturdy table or desk. If there is no shelter nearby, get down near an interior wall or next to low-lying furniture that won’t fall on you, and cover your head and neck with your arms and hands.
How can you tell if a house is earthquake safe?
How can I determine my earthquake risk? A. Interactive hazard maps are available from the California Governor’s Office of Emergency Services (CalOES) at its My Hazards Awareness Map website on the “Earthquake Risk” tab. Then enter your address into the map search field at the top of the page.
Will my house collapse in an earthquake?
Fortunately, most of us live in wood-frame houses. In contrast, a brittle structure is unable to deform during an earthquake without collapsing. ... In an earthquake, your wood-frame house might survive , but your chimney, made of brick not reinforced with rebar, might collapse.
