11. (a) What instrument is used to record earthquake activity?
(b) What scale is used to measure the magnitude of an earthquake?
(c) What scale is used to measure the intensity of an earthquake?
(d) How do the scales you named in (b) and (c) above differ?
12. CUBA MEXICO INDIA
BANGLADESH BURMA
THAILAND 72·6 SRI LANKA SOMALIA MALDIVES
KENYA TANZANIA
MALAYSIA INDONESIA
SEYCHELLES Epicentre
0.2 – 0.4 m Wave height
0.4 – 0.6 m 0.6 – 0.8 m 0.8 – 1.0 m 1.0 – 2.0 m 2.0 – 17.0 m
Arrival time of tsunami
Map of the area affected by the tsunami and time taken for the tsunami wave to travel across the ocean.
(a) Using the diagram above, calculate how long it took the tsunami to reach: (i) Sri Lanka, (ii) Southern India, (iii) Somalia.
(b) What was the wave height after (i) 3 minutes, (ii) 2 hours, (iii) 5 hours?
81·2 COCOS PLATE BELIZE GUATEMALA HONDURAS NICARAGUA COSTA RICA PANAMA VENEZUELA SOUTH AMERICAN PLATE 65·0
NAZCA PLATE
COLOMBIA GUYANA HAITI 20·0 JAMAICA CARIBBEAN PLAT E
NORTH AMERICAN PLATE 20·0
20·0
DOMINICAN REPUBLIC
PUERTO RICO
20·0
OL Long Questions
13. Using the headings below describe and explain the earthquake in Haiti, or any other earthquake you have studied. • Plates involved • What caused the earthquake • Long and short-term effects • Recovery