GEOPHYSICS TASKDEPRESSION

Arranged to Fulfill Lecture of Geophysics

Lecturer : Dwi Teguh Rahardjo, M.Si

By:

Fourth Group

Rindy PS K2311010

Scundy N K23110

PHYSICS EDUCATION DEPARTMENT

FACULTY OF TEACHER TRAINING AND EDUCATION

SEBELAS MARET UNIVERSITY

SURAKARTA

2014

DEPRESSION

Depression is an area that has decreased ( degeneration ) so that its surface is

lower than at sea level. Elongated form of depression called slenk , while the rounded

-called basin. For example, Central Java Depression and Watermelon Valley.

Basin is the shape of the lower face of the earth from the surface of the earth

around him. Basin can also occur on a hilltop or mountain wide caldera that formed a

kind as found in Mount Bromo. Even in some places, basin or depression can have a

height below sea level. On a topographic map, with contour lines drawn basin

shrinking inward, so contrary to the depiction of the image of a hill.

Zone bandung is a mountainous area of fire as well as a zone of depression.

When compared with the flank zone Bogor zone to the north and south of the

mountains to the south that each - each undergo tertiary folding process at the time.

This zone is divided into 4 :

1. Depression Ciancur

Depression Ciancur located at an altitude of 70 - 459 meters to the

west of the towering mountain bark (2211 meters) which is the

youngest volcano. There is also a covered area of volcanic material

from Mount Gede (2958 meters) and Mount Payrango (3019 meters),

for example, the town of Sukabumi.

2. Depression Bandung

In Bandung province is a fertile alluvial plains, reaching 25 meters in

width with a height of 650 - 675 meters. Citarum river and drained by

two rows of the volcano 's flank depression is Burangrang mountain

(2064 meters), Mount Tangkuban Perahu (2076 meters) and Mount

Superior mountain (2203 meters) which is the limit of Bogor zone

while the southern zone bounded by mountain Malabor (23231

meters) , Patuha mountain (2434 meters) and Kencana mountain (2182

meters).

3. Depression Garut

Depression Garut has a width of approximately 50 km with a height of

717 meters. An area surrounded volcano: Kerosak mountain (1630

meters) and Mount Cikuray (2821 meters) is located in the south.

Located on the east side of the mountain Telaga Bodas (2201 meters)

and Mount Galunggung (2108 meters).

EAST JAVA

Southern zone is a continuation of the southern zones in West Java and

Central Java while in the north which is a new element, either Physiographic and

structure. Muria in northern rocky and volcanic leusit Lasem that andisitis not reflect

all the northern series vulkom Java. Moriah was once an island.

To the south there are a number of more or less mountainous eastern

direction, west of the mountains each punctuated by alluvial plains. antiklimak zenith

average width of 50 km and most reach the north coast and from there it was

separated by a narrow position with sand dunes.

The zenith hills separated by a valley with mountains synklinal called

rontablatung zone and longitudinal location of Semarang - Surabaya Wonokromo.

Mountains drum or drums is an advanced anti klonorium of Serayu north in Central

Java. To the south of Semarang mountains width ± 40 km further to the east and

narrowing. Height of approximately 500 m. The mountains near Ngawi transversely

cut off by the river solo that splits into western and eastern parts.

Between the mountains and mountains of southern Java drums pass zone

fisiografisnya state of depression and tektonisnya same as this zone that extends

Bandung. Depression partially filled and covered by a series of young volcanoes and

can be subdivided into 3 parallel lines, ie:

1. Sub- zone ngawi

Depression is the limit synklinal mountainous southern side drums and

is considered as advanced Serayu zone in Central Java. Structurally

ngawi zone extends eastward to the northern coast of East Java

peninsula.

2. Zone solo

Formed by a series of huge volcanic crater - volcanic with

mountainous plains that begin with cleft Sundoro and Central Java to

the east.

3. Sub- zone blitar

Located in the south zone solo. Sub zone Blitar on the selatanya

bounded by mountains to the south and East Java. As well as the

mountains of West Java South East Java in general is lifted and tilted

blocks to the south (the Indian Ocean). Limit escarpment north it is

bordered by an intricate.

Mountains south between the rivers of East Java that is opaque and pacitan

largely composed of hard limestone of the type called Gunung Sewu or the Thousand

Mountains . The northern part of the mountain is composed of old volcanic sediments

and also indicate the presence of the rest of the ( former ) quaternary peneplain .

While the southern part eliff - eliff limited by the rugged abrasion along the Indian

Ocean .

EXAMPLE FOR LIFE DUE geomorphology

In this basin filled with

a variety of loose rock

material (sediments),

primarily from

mainland East Java and

Madura. Based on a map of the distribution of seabed sediments in the basin, shows

that clay and silt sediments occupy most of this sea, and sandy silt to silt generally

occupy a small portion and only in coastal areas. Unless silt and sandy silt in the

waters that form Gresik to Surabaya distribution patterns that indicate the source of

sediment derived from Gresik - Madura Strait and the Java Sea.

The existence of natural phenomena in Sidoarjo Mud LAPINDO, very detrimental to

existing residents in another. Meanwhile submerging houses also cause unpleasant

odors that cause air pollution. Communities around the mud was displaced

LAPINDO any activity becomes terhambat lumpur Porong Sidoarjo become Disaster

- Prone Regions, and there is no other choice The Final Placement (TPA) to the sea

mud was the Madura Strait.

Madura Strait ocean basins south administratively located in the province of

East Java basin and geographically is located at position 114010'25 " BT - 114013'58

"BT, 801'8" LS - 803'28" LS (Figure 1). In the west basin is bordered by the

mainland East Java (Surabaya, Sidoarjo Regency, Pasuruan) bounded by the

shoreline to the north of Surabaya, Sidoarjo to the coast in the southern coastal region

Pasuruan. On the shores of this region leads Surabaya, Porong, and the Brantas River.

In the south, the basin is bordered also with mainland East Java (Probolinggo), the

region bounded by the shoreline on the west Pasuruan, Probolinggo coast, to coast

Besuki in the east, where the coastal region is characterized by the presence of

mountain heights Argopuro in District Besuki. In the eastern basin is bordered by the

Bali Sea that is characterized by changes in the depth that contrasts ranging from -

150 m . The northern boundary of this basin is the area of the south coast of the island

of Madura which is included in the District Sampang and Pamekasan

.