The table below shows earthquake-monitoring data from a plate-boundary study in southern Chile. Fig. 1 shows the positions of an oceanic plate and a contine...

Assessment: Geography 9230 | Paper 1 Mock 01 | Written Paper 1 Subject: Geography - 9230

Question 1 Report

9230-p1-hazards-5-chile-subduction-city

The table below shows earthquake-monitoring data from a plate-boundary study in southern Chile. Fig. 1 shows the positions of an oceanic plate and a continental plate beneath the Andes. The monitoring centre issued a public bulletin after several small earthquakes were detected close to the coast. Students are using the study figure to consider why this region experiences frequent tectonic hazards.

Monitoring stationDistance from coast (km)Number of earthquakes in one weekGreatest recorded magnitude
A12174.1
B5893.6
C12632.8

(a) Which station recorded the greatest earthquake magnitude? [2]
(b) Outline why earthquakes occur at destructive plate margins. [2]
(c) Draw an annotated cross-section showing how Chile can reduce risk from earthquake shaking in a coastal city. [4]

Answer Details

(a) Station A [1]; magnitude 4.1 [1]. [2] (b) Plates move towards each other / one subducts [1]; friction causes stress to build and sudden release produces seismic waves [1]. [2] (c) Four annotations, one mark each: reinforced flexible building frames [1]; strict building-code inspections [1]; emergency open spaces / assembly areas [1]; automatic gas and electricity shut-off [1]; earthquake drills [1]; secure heavy furniture [1]; early warning linked to public alerts [1]. [4]

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