Georesource and Geohazard Potential of Cariu Subdistrict_Mahasinul Fathani and Friends

8/17/2019 Georesource and Geohazard Potential of Cariu Subdistrict_Mahasinul Fathani and Friends

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Georesource and geohazard potential of Cariu subdistrict, Bogor, West

Java

Mahasinul Fathani 2700!000"

#rif Fahruddin $ 2700!00"%

&ga Muha''ad $ 2700!02%

M (a)a # 2700!02"

M *idar 2700!0+0

elas B

-niversitas .ad/ad/aran

Fa)ultas *e)ni) Geologi

20%


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General Geolog

(egional .hsiograph

Based fro' it 'orpholog and litholog :an Be''elen, 45!56 divide the phsiograph of West

Java into four zone 4li)e the picture above6, there is ;

•Ja)arta coastal plains zone

• Bogor zone

• Bandung zone

• and $outhern 'ountains of Western Java zone

and our area is belong in the Bogor zone and


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=ills unit that for' because fold and fault activit

• >ntursion hills

=ills unit that for' because an intrusion

• $lopes of volcano hills

=ills unit that for' because of the depositional of volcano eruption product

• and alluvial plain

-nit that for' because river activit

+ $tratigraph

$tratigraph in this area consist of four roc)s unit, it start fro' the old to the oung ;


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• $and li'estone ith clastone

• Clastone

• #ndesite intrusion

• :olcano product roc) 4 tuff and volcanic breccia6


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• #lluvial deposit

! Geolog structure

! Fold*here are 2 )ind of fold that found in this area, sncline and anticline *he folds

are ; $u)a/adi sncline

Medalsari anticline


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uta'e)ar sncline

Ci)uta'ahi anticline

Cibatutiga sncline

Bantar)uning anticline

!2 FaultFro' field observation , this area consist to )ind of fault, reverse fault and

horizontal fault *he faults are ; Cibeet reverse fault

Cibatutiga horizontal fault

uta'e)ar horizontal fault

Medalsari horizontal fault

Bantar)uning horizontal fault

Ci)uta'ahi horizontal fault

? Geological historGeological histor of this area began in ;

• Middle Miocene 4@+ A @!6

*he condition at this ti'e as a shallo 'arine beteen 20 A 00 'eter above sea level

(oc)s ere deposited ie sand li'estone unit of alternating clastone 4.arigi

For'ation6 Measured the thic)ness of this unit is %%02? '

• 9ate Miocene 4@? A @"6

*he condition at this ti'e there is precipitated aligned on it na'el clastone units

4For'ation aliangu6 in shallo 'arine depositional environ'ent ith a depth of ?820'eters above sea level to 20800 'eters above sea level

• &arl .liocene A .leistocene

*ectonic activit began to start in this ti'e, so that the roc)s undergo a process of

folding, uplifting and faulting *his tectonic process continues until .leistocene,

folloed b volcanis'

*he presence of volcanic activities at .liocene to the .leistocene creating intrusive and

e)strusive roc) >ntrusive roc)s in the for' of intrusion on Mount (ung)ing and Mount#seupan While e)strusive roc) for' of 'aterials results :olcano eruption li)e volcanic

breccias, crstal tuff and lapilli tuff that cover previous lithologies the deposition source is

esti'ated to co'e fro' Mount $anggabuana located in the south of this area


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disaster seriousl enough Based on the 'apping conducted in ! districts in the cit of Bogor,

the fourteen districts that have a fairl unstable ground contours and high soil 'ove'ent *he

fourteen districts that include Cigudeg, $u)a/aa, .a'i/ahan, $u)a'a)'ur, Baba)an Madang,

Castle, Cigo'bong, Ci/eru), Caringin, Ciai, Mega'endung, Cisarua, *albot, Cariu, and

Coventr

$ubdistrict Cariu, one of hich is an area that has the potential for landslides and flash

floods #n area that has the potential for ground 'ove'ent of 'ediu' to high level *he 'iddle

level is an area that has the potential to occur 'iddle ground 'ove'ent >n this zone can occur if

the ground 'otion above nor'al rainfall, especiall in the areas bordering the river valle

escarp'ent, the cliff path or if the slopes i'paired # high level is an area that has a high

potential for ground 'ove'ent occurs >n this zone can occur if the ground 'otion above nor'al

rainfall, hile the old ground 'otion can be active again

Condition of Geological 1isaster area 41istrict of Cariu6

>n general, in the :illage Me)arangi 'orphological for' of the hillsides ith a slope

rather steep to steep >n the vicinit of the disaster site is an area of steep slopes ith so'e places

there is a cliff ith a slope beteen +0 8 !? Constituent roc)s at the site ground 'otion is

'udstone containing laers and nodules napalan hard li'estone, 'arl and laers of gra

li'estone fro' $ubang For'ation *he eathering of volcanic roc)s in the for' of sludge, itha thic)ness of 'eter

9and in the disaster area is a residential land 'ove'ents >n the landslide is an area of

'i3ed far's Based Map Forecast .otential #reas Dccurs Move'ent 9and on the Moon in June

20! in West Java 4Geolog #genc, Center for :olcanolog and Geological =azard Mitigation6,

the affected areas include zones of potential ground 'ove'ent 'ediu' 8 high 'eaning in this

region can occur ground 'otion if rainfall above nor'al, especiall in areas bordering the river

valle, escarp'ent, the cliff path or if the slopes susceptible to interference and ground 'otionti'e can be active again

Ground 'ove'ent occurred at this location are co'posed b soil eathering nest

4volcanic roc)s6 and is above the bedroc) that are 'ore resistant =igh rainfall resulting slope

beco'es saturated and an increase in the eight of the soil 'ass *his condition causes an


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increase in pore ater pressure and reduced soil holding capacit Coupled ith a steep slope

that led to the land easier to 'ove to find a ne e


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Conclusion

West Java into four zone 4li)e the picture above6, there is ;

• Ja)arta coastal plains zone

• Bogor zone

• Bandung zone

• and $outhern 'ountains of Western Java zone

Cariu area in Bogor district has no econo'ical 'etal deposits 4'aterials # and B6 but the area

suitable for


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Georesource and Geohazard Potential of Cariu Subdistrict_Mahasinul Fathani and Friends

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