---
title: "Cross Vlf Anomaly"
method: POST
path: "/api/v1/cross-physics/vlf-anomaly"
---

# Cross Vlf Anomaly

`POST /api/v1/cross-physics/vlf-anomaly`

## Request

- Base URL: `https://www.deepmapai.com`
- URL: `https://www.deepmapai.com/api/v1/cross-physics/vlf-anomaly`
- Auth: none declared

VLF transmitter signal -> earthquake precursor detection.

Monitors VLF transmitter signals (NAA 24.0 kHz, NLK 24.8 kHz, etc.)
propagating in the Earth-ionosphere waveguide. Detects pre-earthquake
D-region ionospheric perturbations using Hayakawa's nighttime method
(simultaneous trend depression and dispersion increase).

## Headers

- `x-api-key` string

## Request body

- VlfAnomalyRequest: VLF transmitter signal -> earthquake precursor detection.
  - `station_id` string: VLF transmitter callsign (NAA, NLK, GBZ, JJI, NWC, NPM)
  - `days` integer: Number of days of data
  - `use_demo` boolean

## Response `200`

Successful Response

- unknown

## Other responses

- `422`: Validation Error

---

[API](https://skmtc.dev/deepmapai/apis/deepmap-ai.md) · [All operations](https://skmtc.dev/deepmapai/apis/deepmap-ai/llms.txt) · [OpenAPI document](https://skmtc.dev/deepmapai/apis/deepmap-ai/revisions/dab995d977d0?raw)