Modified Mercalli Scale Flashcards
Intensity where it is perceptible to people under favorable circumstances
Intensity I - Scarcely Perceptible
Intensity where delicately balance objects are disturbed slightly
Intensity I - Scarcely Perceptible
Intensity where still water in containers oscillates slowly
Intensity I - Scarcely Perceptible
Intensity where it is felt by few individuals at rest indoors
Intensity II - Slightly Felt
Intensity where hanging objects swing slightly
Intensity II - Slightly Felt
Intensity where still water in containers oscillates noticeably
Intensity II - Slightly Felt
Intensity where it is felt by many people indoors especially in upper floors of buildings
Intensity III - Weak
Intensity where vibration is felt like one passing of a light truck
Intensity III - Weak
Intensity where dizziness and nausea are experienced by some people
Intensity III - Weak
Intensity where hanging objects swing moderately
Intensity III - Weak
Intensity where still water in containers oscillates moderately
Intensity III - Weak
Intensity where it is felt generally by people indoors and by some people outdoors
Intensity IV - Moderately Strong
Intensity where light sleepers are awakened
Intensity IV - Moderately Strong
Intensity where vibration is felt like a passing of heavy truck
Intensity IV - Moderately Strong
Intensity where hanging objects swing considerably
Intensity IV - Moderately Strong
Intensity where dinner, plates, glasses, windows, and doors rattle
Intensity IV - Moderately Strong
Intensity where floors and walls of wood framed buildings creak
Intensity IV - Moderately Strong
Intensity where standing motor cars may rock slightly
Intensity IV - Moderately Strong
Intensity where liquids in containers are slightly disturbed
Intensity IV - Moderately Strong
Intensity where water in containers oscillate strongly
Intensity IV - Moderately Strong
Intensity where rumbling sound may sometimes be heard
Intensity IV - Moderately Strong
Intensity where it is generally felt by most people indoors and outdoors
Intensity V - Strong
Intensity where some are frightened, some run outdoors
Intensity V - Strong
Intensity where strong shaking and rocking felt throughout building
Intensity V - Strong
Intensity where hanging objects swing violently
Intensity V - Strong
Intensity where dining utensils clatter and clink; some are broken
Intensity V - Strong
Intensity where small, light and unstable objects may fall or overturn
Intensity V - Strong
Intensity where liquids spill from filled open containers
Intensity V - Strong
Intensity where standing vehicles rock noticeably
Intensity V - Strong
Intensity where shaking of leaves and twigs of trees are noticeable
Intensity V - Strong
Intensity where many people are frightened; many run outdoors
Intensity VI - Very Strong
Intensity where some people lose their balance
Intensity VI - Very Strong
Intensity where motorists feel like driving in flat tires
Intensity VI - Very Strong
Intensity where heavy objects or furniture move or may be shifted
Intensity VI - Very Strong
Intensity where small church bells may ring
Intensity VI - Very Strong
Intensity where wall plaster may crack
Intensity VI - Very Strong
Intensity where very old or poorly built houses and man-made structures are slightly damaged though well-built structures are not affected
Intensity VI - Very Strong
Intensity where limited rockfalls and rolling boulders occur in hilly to mountainous areas and escarpments
Intensity VI - Very Strong
Intensity where trees are noticeably shaken
Intensity VI - Very Strong
Intensity where most people are frightened and run outdoors
Intensity VII - Destructive
Intensity where people find it difficult to stand in upper floors
Intensity VII - Destructive
Intensity where heavy objects and furniture overturn or topple
Intensity VII - Destructive
Intensity where big church bell may ring
Intensity VII - Destructive
Intensity where old or poorly built structures suffer considerably damage
Intensity VII - Destructive
Intensity where some well built structures are slightly damage
Intensity VII - Destructive
Intensity where some cracks may appear on dikes, fish ponds, road surface, or concrete hollow block walls
Intensity VII - Destructive
Intensity where limited liquefaction, lateral spreading and landslide are observed
Intensity VII - Destructive
Intensity where trees are shaken strongly
Intensity VII - Destructive
Intensity where people are panicky
Intensity VIII - Very Destructive
Intensity where people find it difficult to stand even outdoors
Intensity VIII - Very Destructive
Intensity where many well built buildings are considerably damaged
Intensity VIII - Very Destructive
Intensity where concrete dikes and foundation of bridges are destroyed by ground settling or toppling
Intensity VIII - Very Destructive
Intensity where railway tracks are bent or broken
Intensity VIII - Very Destructive
Intensity where tombstones may be displaced, twisted or overturned
Intensity VIII - Very Destructive
Intensity where utility posts, towers and monuments may tilt or topple
Intensity VIII - Very Destructive
Intensity where water and sewer pipes may be bent, twisted or broken
Intensity VIII - Very Destructive
Intensity where liquefaction and lateral spreading cause man-made structure to sink, tilt or topple
Intensity VIII - Very Destructive
Intensity where numerous landslides and rockfalls occur in mountainous and hilly areas
Intensity VIII - Very Destructive
Intensity where boulders are thrown out from their positions particularly near the epicenter
Intensity VIII - Very Destructive
Intensity where fissures and faults rapture may be observed
Intensity VIII - Very Destructive
Intensity where trees are violently shaken
Intensity VIII - Very Destructive
Intensity where water splash or stop over dikes or banks of rivers
Intensity VIII - Very Destructive
Intensity where people are forcibly thrown to ground.
Intensity IX - Devastating
Intensity where many cry and shaken with fear
Intensity IX - Devastating
Intensity where most buildings are totally damaged
Intensity IX - Devastating
Intensity where bridges and elevated concrete structures are toppled or destroyed
Intensity IX - Devastating
Intensity where numerous utility posts, towers and monument are tilted, toppled or broken
Intensity IX - Devastating
Intensity where water sewer pipes are bent, twisted or broken
Intensity IX - Devastating
Intensity where landslides, liquefaction with lateral spreadings and sandboils are widespread
Intensity IX - Devastating
Intensity where the ground is distorted into undulations
Intensity IX - Devastating
Intensity where trees are shaken very violently with some toppled or broken
Intensity IX - Devastating
Intensity where boulders are commonly thrown out
Intensity IX - Devastating
Intensity where river water splashes violently on slops over dikes and banks
Intensity IX - Devastating
Intensity where practically all man-made structures are destroyed
Intensity X - Completely Devastating
Intensity where massive landslides and liquefaction, large scale subsidence and uplifting of land forms many ground fissures are observed
Intensity X - Completely Devastating
Intensity where changes in river courses and destructive seiches in large lakes occur
Intensity X - Completely Devastating
Intensity where many trees are toppled broken and uprooted
Intensity X - Completely Devastating