Paleo magnetism 30,000 years ago to today

In summary, the IAGA database is outdated and does not contain directional data for the period you are interested in. There are global models that combine the two databases, but they are limited to the last 10,000 years because of data availability.
  • #1
al2207
24
0
how can i find data for Earth magnetism for the period 30,000 years to today, is it possible to control magnetism forces
thanks
 
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  • #3
While the magnetic field is relatively weak - you can override it with a small magnet, for example - it is global in extent and that represents the expenditure of a large amount of energy. No plausible means of controlling magnetic forces on other than a very small, local level exist, nor could be envisaged in a foreseeable future.
 
  • #5
What sort of data are you seeking? Polar wandering? Variations in field strength? Orientation in recent sediments?
 
  • #6
Bystander said:
What sort of data are you seeking? Polar wandering? Variations in field strength? Orientation in recent sediments?
mostly variation of Earth magnetic field during that period
 
  • #7
Local strength (specific geographic locations), or "overall."
 
  • #8
south America
 
  • #9
The IAGA database available through NOAA is out-dated, so don't use it.
The most up-to-date version of the database for your time of interest can be found here http://geomagia.gfz-potsdam.de/
There are two databases, one based on sedimentary analyses, which yields only inclination and relative intensity variations, but of high resolution.
The other, is the archeomagnetic and volcanic database, which has absolute measures of field intensity, but these are only spot readings and often no directional data are available.

There are also global models, which combine the two databases to estimate global variations. These are limited to the last 10,000 years (due to data availability) and inevitably involve smoothing.

On a practical note. South America is a relatively poorly sampled region for paleomagnetism, for a number of reasons. So the data from this region is sparse and often of low quality. I think the S. America data only go back a few thousand years.

Hope this helps.
 
  • #10
geo101 said:
On a practical note. South America is a relatively poorly sampled region for paleomagnetism
Thank you for confirming my suspicions.
 
  • #11
many thanks ,it look better now but after a very fast reading period from 15,000 to 10,000 seem the poor child
 

1. What is paleomagnetism and how is it related to the Earth's magnetic field?

Paleomagnetism is the study of the Earth's magnetic field in the past. The Earth's magnetic field is generated by the movement of molten iron in the outer core. When this molten iron cools and solidifies, it preserves the direction and strength of the Earth's magnetic field at that time. By studying the magnetic properties of rocks and sediments, we can reconstruct the Earth's magnetic field in the past.

2. How does paleomagnetism help us understand changes in the Earth's magnetic field over time?

By analyzing the magnetic properties of rocks and sediments from different time periods, we can create a record of changes in the Earth's magnetic field. This allows us to track the movement of the Earth's magnetic poles, as well as changes in the strength and direction of the magnetic field. It also provides insight into the processes that drive these changes over time.

3. What can we learn about the Earth's past climate from paleomagnetism?

The Earth's magnetic field is closely linked to the Earth's climate, as it helps to shield the planet from solar winds and cosmic radiation. By studying changes in the Earth's magnetic field, we can also infer changes in the Earth's climate. For example, during times of low magnetic field strength, there is an increase in the amount of cosmic radiation reaching the Earth's surface, which can affect the formation of certain types of rocks and sediments.

4. How far back in time can paleomagnetism provide information about the Earth's magnetic field?

Paleomagnetism can provide information about the Earth's magnetic field as far back as the formation of the oldest rocks on Earth, which are approximately 4 billion years old. However, the further back in time we go, the less detailed the record becomes, as rocks and sediments can be altered or destroyed over time.

5. How does studying paleomagnetism help us understand the Earth's geologic history?

Studying paleomagnetism allows us to create a timeline of changes in the Earth's magnetic field, which can be used to correlate and date different rock formations and geological events. This helps us understand the movement and formation of continents, as well as the timing of major geological events such as volcanic eruptions and mass extinctions.

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