Probabilistic Earthquake Risk Maps of Tasmania Reading Answers

Jan 10, 2025

Probabilistic Earthquake Risk Maps of Tasmania Reading Answers is an academic reading answers topic. Probabilistic Earthquake Risk Maps of Tasmania Reading Answers has a total of 4 IELTS questions in total. In the questions given you have to choose the correct answer from the options given.

The IELTS Reading section is a crucial component of the IELTS exam, designed to assess a candidate's ability to comprehend and analyze different types of passages. In this passage, you will engage with a series of IELTS reading practice questions that simulate real test scenarios. These questions are aimed at improving your skills in identifying key ideas, extracting specific information, and making inferences. Whether you are preparing for the Academic or General Training module, practicing these IELTS reading questions will help you become familiar with the format and boost your confidence for the actual test.

Check: Get 10 Free Sample Papers

Check: Register for IELTS Coaching - Join for Free Trial Class Now

Section1

PROBABILISTIC EARTHQUAKE RISK MAPS OF TASMANIA

New earthquake risk maps of Tasmania have been prepared depicting risk by contours of peak ground velocity, acceleration and intensity with a 10 per cent probability of being exceeded in a 50 year period. The Cornell- McGuire method was used for this. The maps are based on seismicity up to the end of 1984, including the events of the 1883-1892 earthquake swarms in the east of Flinders Island and other historical data. The earthquake process was assumed to be Poissonian, so foreshocks and aftershocks were eliminated from the analysis. For this earthquake risk assessment, average eastern Australian background seismicity and attenuation for average site conditions were used.

In the Tasmanian region, the risk of earthquake source zones mostly affects the West Tasman Sea Zone and the Western Tasmanian Zone. The West Tasman Sea Zone, east of Flinders and

Cape Barren Islands, appears to have been the site of the 1883-1892 swarm, with at least three

intensity-deduced Richter magnitude 6.0-7.0 events. Consequently, the highest risk land areas are Flinders and Cape Barren Islands, which lie predominantly between the 60 mm.s-1/O.6 m.s-2 and 120 mm.s-I/I.2 m.s-2 contours, with the risk increasing to the east. In the Western Tasmanian Zone, the largest event recorded was in 1880. It had an intensity-deduced Richter magnitude of 5.5. The northern part of western Tasmania (enclosed by the 59 mm.s-1/O.55 m-2 contour) is the second highest risk region.

At Hobart and Launceston, outside the source zones, the values are 25 mm-1/0.21 m.s-2 and 30 mm.s- 1/0.29 m.s-2 respectively, corresponding to a I0 per cent chance of an intensity MMIV -V being exceeded in a 50-year period. However, it appears that site amplification of strong ground motion takes place in some parts of Launceston, and this should be considered when zoning for the Building Code. The chief contributions to uncertainty in the estimates of earthquake risk are uncertainties in early earthquake locations and magnitudes, and in strong ground motion attenuation.

Questions 25-28

Choose option A, B or C.

25.According to the earthquake analysis it is predicted that

A. The probability of intensity will reduce, coming decade

B. Ground velocity will increase by a certain percent

C. The ground velocity, Momentum and intensity are going to increase every 50 years

Answer: C

Supporting statement: peak ground velocity, acceleration and intensity with a 10 per cent probability of being exceeded in a 50 year period.

Keywords: velocity, 50 year

Keyword Location: Para 1, Lines 2-3

Explanation: The text states that Peak ground velocity, acceleration, and intensity contours that have a 10% chance of being surpassed during a 50-year period have been used to create new earthquake risk maps for Tasmania.This was accomplished using the Cornell-McGuire method. Seismology up until the end of 1984, including the 1883–1892 earthquake swarms east of Flinders Island and other historical data, served as the basis for the maps.

26.Earthquake Swarm

A. The procedure of the seismic waves was clear

B. Struck the complete Flinders Island

C. The range of shocks were eliminated from analysis

Answer: C

Supporting statement:The earthquake process was assumed to be Poissonian, so foreshocks and aftershocks were eliminated from the analysis.

Keywords: earthquake, eliminated

Keyword Location: Para 1, Lines 5-6

Explanation: According to the text the maps created by the Cornell-McGuire approach are based on seismicity up until the end of 1984, which includes historical data including the events of the 1883–1892 earthquake swarms east of Flinders Island. Because the earthquake mechanism was considered to be Poissonian, the study excluded foreshocks and aftershocks. Average background seismicity and attenuation for typical site circumstances in eastern Australia were utilized for this earthquake risk assessment.

27.Earthquake source zone

A. In West Tasman sea zone caused the Swarm

B. Appears to have increase in magnitude

C. Deduced in its Richter scale

Answer: A

Supporting statement:the risk of earthquake source zones mostly affects the West Tasman Sea Zone and the Western Tasmanian Zone

Keywords: risk, affects

Keyword Location: Para 2, Line 1

Explanation: The text indicates that the Western Tasmanian and West Tasman Sea zones are the most vulnerable to earthquake source zones in the Tasmanian area. The 1883–1892 swarm appears to have occurred in the West Tasman Sea Zone, east of the Flinders and Cape Barren Islands, with at least three Richter magnitude 6.0–7.0 earthquakes estimated to have occurred there.

28.Which place is outside the effect of earthquake zone?

A. Flinders Islands

B. Cape Barren Islands

C. Hobart

Answer: C

Supporting statement:At Hobart and Launceston, outside the source zones,

Keywords: Hobert, zones

Keyword Location: Para 3, Line 1

Explanation: The Text highlights that the numbers are 25 mm-1/0.21 m.s-2 at Hobart and 30 mm.s-1/0.29 m.s-2 at Launceston, which are beyond the source zones. These values indicate an I0 percent probability of an intensity MMIV-V being surpassed during a 50-year period.

Read More IELTS Reading Related Samples