Dear Sinnappoo;

There are sources as global landslide inventory maps

for instance NASA landslide viewer: https://maps.nccs.nasa.gov/arcgis/apps/webappviewer/index.html?id=824ea5864ec8423fb985b33ee6bc05b7

but gathering all information in a global scale is a tough job. Besides, global resources are not as detailed as local ones. So, I recommend using local sources (for instance province-wide scale) as they can provide more up-to-date and more details along with a landslide inventory map.

Thanks Md Mehrabi for quick answer. Much appreciated.

Best regards

Ravi

I cant say about global. But recently we published a Pan India landslide database, along with all causative factors. Please see the link below:

Article Geospatial landslide inventory of India—an insight into occu...

Dear Priyom

Thanks very much for providing the link.

Best regards

Ravi

Hello

following previous comments, I can say that global database are feeded with national/regional inventory. So it becomes convenient to approach national or regional geological boards that are quite updated, depending on the capabilities of each country of course. For example in Italy there is

https://www.progettoiffi.isprambiente.it/

which is progressively implemented and ameliorated.

Look for analogous database in your region.

Regards

The British Geological Survey have carried out a detailed survey of landslides for the UK and constantly update it. I would suggest that most countries will have similar databases. Collating the databases from individual countries is the best way forward, as any global database is likely to be lagging in timescale and lacking detail. That will prove a big task, but I suggest one well worth attempting. In the meantime I will see if I can start you off with a few national databases. Watch this space!

George Strachan

A global landslide (mass wasting) database is hard to be built because it is a multiple-parameter land-forming process that is the "trigger". Bedrock lithologies, structural geology and climate are hard to quantify influences as the landscape is sculpured. And this is valid for all these exogenous processes shaping the landscape at different periods during the geological past. Therefore, my recommendation is to start with images from Google Maps covering your study area and collect as many as possible data to come to grips with the regional aspects before you try and compare your study site with others on a global basis. What do you expect from such an insight into the global variation of landslides?

HGD

I agree Harald. I too doubt the existence of a global database of mass wastage phenomena. That I why I suggest a search of nationally compiled landslide databases.

George

Dear Sinnappoo,

Please find the following 4 websites:-

https://www.sgu.se/en/products/geological-data/data-in-web-map-services-wmf

https://www.usgs.gov/science-explorer-results

https://www.ngu.no/en/topic/landslides

https://www.bgs.ac.uk/geology-projects/landslides/national-landslide-database

You will need to search for databases on landslides, but don't be afraid to contact staff members at these institutions. They are usually very happy to help locate material. For example, the Norwegian site has a list of contacts including Lena Rubensdotter; also the BGS has a good contact via Catherine Pennington. Wishing you success in your research.

Kind regards

George Strachan

Hello Sinnappoo

I enclose the links for the Italian database, in English (available also in German and French)

https://idrogeo.isprambiente.it/app/ (then select languagae)

https://www.progettoiffi.isprambiente.it/en/inventory/

As you probably know, Italy has two main mountain ranges, the Alps and the Appenines, where thousands of different events have been studied, described and recorded.

Hope this can help.

Regards

C.O.

Dear Claudio, George and Harald,

Thanks very much for the help.

Much appreciated.

Best regards

Ravi

Dear Harald

I am bit curious with local factors influencing landslides and that is why I would like to see the global database.

Best regards

Ravi

Dear Dr. Ravindran,

Mass wasting in its fastest and way is a very complex land-forming processes where you should consider always the bedrock-lithology, the structural geology, the mineralogy (particularly clay minerals), climate and sorry to say the (stupid) human impact.

DILL, H.G., BALABAN, S.-I., BUZATU, A., BORNEMANN, A., and TECHMER, A. (2021) The Quaternary volcanogenic landscape and volcaniclastic sediments of the Netherlands Antilles - markers for an in-active volcanic arc.- International Journal of Earth Sciences (on-line)

DILL, H.G., BUZATU, A., and BALABAN, S.-I. (2021) Straight to Low-Sinuosity Drainage Systems in a Variscan-Type Orogen—Constraints from Tectonics, Lithology and Climate.- Minerals: 2021, 11, 933. https://doi.org/10.3390/min11090933, 58 pp.

DILL, H.G., BUZATU, A., and BALABAN S.-I. (2021) Coastal morphology and heavy mineral accumulation in an upper-macrotidal environment– A geological-mineralogical approach from source to trap site in a natural placer laboratory (Channel Islands, Great Britain).- Ore Geology Reviews 138: 104311

DILL, H.G., KUS J., BUZATU A., BALABAN S.-I. ,KAUFHOLD S., and BORREGO A. G. (2021) Organic debris and allochthonous coal in Quaternary landforms within a periglacial setting (Longyearbyen Mining District, Norway) - A multi-disciplinary study (coal geology-geomorphology-sedimentology).- International Journal of Coal Geology 233: 103625

DILL, H.G., BUZATU A., BALABAN S.-I. , UFER K., GÓMEZ TAPIAS J., BÎRGĂOANU D. and CRAMER T. (2020) The “badland trilogy” of the Desierto de la Tatacoa, Upper Magdalena Valley, Colombia, a result of geodynamics and climate: With a review of badland landscapes.- Catena 194: 1-20.

DILL, H.G., BUZATU A., BALABAN S.-I. , UFER K., TECHMER A. SCHEDLINSKY, W., and FÜSSL M., (2020) The transition of very coarse-grained meandering to straight fluvial drainage systems in a tectonized foreland-basement landscape during the Holocene (SE Germany) – A joint geomorphological-geological study.- Geomorphology 370: 107364.

DILL H.G., BUZATU A., GOLDMANN S., KAUFHOLD S., and BÎRGĂOANU D. (2020) Coastal landforms of “Meso-Afro-American” and “Neo-American” landscapes in the periglacial South Atlantic Ocean: With special reference to the clast orientation, morphology, and granulometry of continental and marine sediments.- Journal of South American Earth Sciences 98: 102385

DILL, H.G. (2017) Residual clay deposits on basement rocks: The impact of climate and the geological setting on supergene argillitization in the Bohemian Massif (Central Europe) and across the globe.- Earth Sciences Reviews 165: 1-58.

DILL, H.G., HAHNE, K. and SHAQOUR, F. (2012) Anatomy of landslides along the Dead-Sea-Transform Fault System in NW Jordan.- Geomorphology, 141-142: 134-149.

DILL H.G., LUDWIG R.-R., KATHEWERA A. and MWENELUPEMBE J. (2005) A lithofacies terrain model for the Blantyre Region: Implications for the interpretation of palaeosavanna depositional systems and for environmental geology and economic geology in southern Malawi.- Journal of African Earth Sciences, 41: 341-393.

DILL, H.G., KHISHIGSUREN, S., MAJIGSUREN, YO. , MYAGMARSUREN S. and BULGAMAA, J. (2006) Geomorphological studies along a transect from the taiga to the desert in Central Mongolia-Evolution of landforms in the mid-latitude continental interior as a function of climate and vegetation.- Journal for Asian Earth Sciences, 27: 241-264.

DILL, H.G., KHAREL, B.D., SINGH, V.K., PIYA, B., BUSCH, K. and GEYH, M. (2001) Sedimentology and paleogeographic evolution of the intermontane Kathmandu Basin, Nepal, during the Pliocene and Quaternary. Implications for formation of deposits of economic interest.- Journal for Asian Earth Sciences, 19: 777-804.

All of them are available on the RG server upon request

HGD

Dear Sinnappoo,

i think i see now now why you are looking for a global database of landslides. You are seeking out the factor or factors which are more universal and less local in causing landslides. Your search is most commendable, but at present you are not quite sure how to approach it, am I right? May I suggest that you propose the following hypothesis “that subaerial landslides are evenly distributed across the land surface of the Earth”. Clearly, that is not the case, however one factor is critical in the distribution of landslides, namely topography in the form of slope gradient. The presence or absence of slope gradient must surely be the most critical factor in slope movement. In the examples Harald, Claudio and myself have given all cite mountainous areas. That is not to say that landslides do not occur in areas approaching level ground - e.g. flows of quick clays as in Norway and Quebec - but they are rare. The vast majority of debris flows and the like occur on steep slopes with gradients of 25 - 45 degrees. Hence the majority of studies focus on areas such as the Andes, Rockies, Norway, Italy, Alps, Himalayas, Appalachians, Scottish Highlands, New Zealand for example. The requisite slope gradient will then depend on rock and soil type, depth and clay content among other things (see what Harald has outlined and Claudio).

In the passing, I am very pleased to see Harald’s contribution. I have been missing your good plain common sense, Harald.

kind regards

George Strachan

Dear Prof Harald

Thanks very much for providing valuable information.

Much appreciated Sir.

Best regards

Ravi

Dear George

Thanks very much for your insight Sir. I agree with your comments. I agree that slope gradient is one of the universal factors.

Best regards

Ravi

Sinnappoo,

Harald mention the “stupid “ human impact and how right he is. In global terms the human impact is universal and devastating. The effects must translate into greatly increased mass wastage in over-crowded areas, e.g. Hong Kong, Rio de Janeiro, Coast Range of San Francisco. Maybe you should compare the levels of landslide activity in urban with rural areas. Worth a thought. After all population pressures globally are a far more instant threat to humanity than global warming - yet no one wants to talk of them!

Kind regards

George

Dear George

Thanks very much for your advice. I agree with you. Probably low income earners are living on these steep slopes. Local policy makers should highlight the vulnerability of landslides. Drainage control in these vulnerable areas may be an issue. I will work on it.

Best regards

Ravi

Sir,

this videos may be help you

https://www.youtube.com/watch?v=0Jq3_V5Vw1Y

https://www.youtube.com/watch?v=f1n4RQx9T0Y

Hi Cheshini

Thanks very much.

Much appreciated.

Best regards

Ravi