Geology Magnetostratigraphy Reversal Frequency Calculator
Actual magnetostratigraphic identified reversals per complete recorded Ma, not polarity chrons boundary ambiguity, true unsampled reversal frequency or geomagnetic forecast. Actual independently matched quantities/units required; not infer causal effect, clinical guidance or safe design.
Description
A polarity-reversal frequency compares independently identified reversals with a complete recorded interval.
A polarity-reversal frequency compares independently identified reversals with a complete recorded interval.1
It is a count rate rather than a deterministic reversal cycle. Use this tool to calculate the stated observation or conditional model from supplied measurements.
When to use Geology Magnetostratigraphy Reversal Frequency Calculator
Use this tool to calculate the stated observation or conditional model from supplied measurements. Establish the sample and coordinate basis, matching units, calibration source and applicable model assumptions.
How to use Geology Magnetostratigraphy Reversal Frequency Calculator and understand its results
- Establish the sample and coordinate basis, matching units, calibration source and applicable model assumptions.
- Enter actualIndependentlyIdentifiedPolarityReversalCount, actualCompleteRecordedIntervalMillionsOfYears, using the field meanings and rules below, then run the tool.
- Read result.observedRatio. Interpret each field using the units, signs and evidence rules below.
- If input validation fails, correct the reported field and run again. Before applying a successful result, check the stated reference scope, units, assumptions and any retained unknown evidence.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| actualIndependentlyIdentifiedPolarityReversalCount | Actual independently identified polarity reversal count | number | Required |
| actualCompleteRecordedIntervalMillionsOfYears | Actual complete recorded interval millions of years | number | Required |
Require nonnegative actualIndependentlyIdentifiedPolarityReversalCount and positive actualCompleteRecordedIntervalMillionsOfYears. Divide numerator by denominator without percent scaling. Values need not be integers and the tool does not require numerator≤denominator or clamp the result. Establish matching measurement scope and units independently. The result is reversals per million years, not a dimensionless ratio.
result=1×actualIndependentlyIdentifiedPolarityReversalCount/actualCompleteRecordedIntervalMillionsOfYears Apply the field units and exact ordering, boundary and evidence rules above.
| Output field | Meaning | Value type |
|---|---|---|
| result | Structured result containing the calculation or selected reference fields below | object |
| result.observedRatio | Observed reversals per million years | number |
{
"input": {
"actualIndependentlyIdentifiedPolarityReversalCount": 2,
"actualCompleteRecordedIntervalMillionsOfYears": 4
},
"output": {
"result": {
"observedRatio": 0.5
}
}
}Limitations and assumptions
It is a count rate rather than a deterministic reversal cycle. Results depend on the independently established measurement basis and the exact model assumptions above.
Every listed input requires an explicit value. Unexpected fields, incorrect value types, nonfinite numbers and sparse numeric arrays fail validation; tool-specific bounds and alignment rules apply as described above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful calculation that reports a false comparison or retains unknown evidence.
Alternative or Complementary methods
Use Geology Paleomagnetic Pole Position Calculator to examine a related aspect: Paleomagnetic pole positions depend on site coordinates and adopted dipole conventions.
Use Geology Paleomagnetic Inclination To Paleolatitude Calculator where its separate inputs and scope apply: Inclination can be related to paleolatitude under a geocentric axial-dipole assumption.
References
Similar or alternative tools
- Geology Paleomagnetic Pole Position Calculator
Paleomagnetic pole positions depend on site coordinates and adopted dipole conventions.
- Geology Paleomagnetic Inclination To Paleolatitude Calculator
Inclination can be related to paleolatitude under a geocentric axial-dipole assumption.