The Elements of economic geology

Bibliographic data

Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part IV. Engineering geology

Collection:: Economics Books

EARTHQUAKES 253 foundations had been weakened by drainage when the water was withdrawn from its front during the advance of the earthquake wave, and it slid down the mud slope into the river. The Lisbon Earthquake was recorded in France only in the extreme S.W.; but it has been assigned an un- usually wide range as a shock in Derbyshire has been attri- buted to it, but was doubtless due to an independent local sarthquake. Along earthquake stricken coasts most of the destruction is often wrought by a huge wave which rolls in from the sea. Harbours and coast towns in seismic belts are only safe if sheltered from the open sea, or above the reach of earthquake waves. Some strongly constructed buildings collapsed during the San Francisco Earthquake in 1906, as they were erected on land made by filling bays with loose material, and the weak foundations had given trouble before the earthquake. Similar buildings on firm ground were only shaken, though some were destroyed by fire. The most fatal earthquake for which there are accurate records was at Tokyo on the 1st September, 1923; the official roll of killed and missing is 142,807. The shock there was moderate; well-built masonry buildings and even fragile structures on their roofs were not injured. The loss of life was due to the earthquake happening just before the midday meal; the charcoal braziers used for cooking were over- thrown ; fallen laths and scraps of wallpaper were ignited ; and many fires broke out simultaneously. The people flocked for shelter into open spaces where they were suffo- cated by smoke. The damage at Tokyo was estimated at £1,000,000,000, of which 95 per cent. was due to fire. B. Anti-EarTHQUARE ConsTRUCTION—No ordinary build- ing can resist the most violent grade of earthquake without serious damage. In the Assam Earthquake of 1896 Shillong was jerked 18 inches to and fro 200 times a minute. Walls were shaken to pieces and the roofs settled down over piles of broken masonry. Tree trunks were snapped across just above the ground. This terrific oscillation was combined with an upward jerk by which huge stones were hurled into the air, at an angle of over 60°; after rising 4 feet they struck the ground 6% feet from their original position,

Access restriction

Copyright

fullscreen: The Elements of economic geology

Monograph

Chapter

Table of contents

Download

Monograph

Chapter

This page

Image fragment

Citation links

Citation recommendation