---
title: "Modes"
method: POST
path: "/api/v1/cross/free-oscillations/modes"
tags: ["Earth Free Oscillations (0S0 / 0S2 / 0T2)"]
---

# Modes

`POST /api/v1/cross/free-oscillations/modes`

## Request

- Base URL: `https://www.deepmapai.com`
- URL: `https://www.deepmapai.com/api/v1/cross/free-oscillations/modes`
- Auth: none declared

## Query parameters

- `x_api_key` string, nullable

## Request body

- FosRequest
  - `lat` number, required: Site latitude (WGS-84)
  - `lon` number, required: Site longitude (WGS-84)
  - `days_back` integer: FFT analysis window (days)
  - `snr_threshold` number: Mode-excitation SNR cutoff

## Response `200`

Successful Response

- object

## 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)