---
title: "Post Seismic Viscosity"
method: POST
path: "/api/v1/cross/post-seismic/viscosity"
tags: ["Post-Seismic Normal Mode Tracker"]
---

# Post Seismic Viscosity

`POST /api/v1/cross/post-seismic/viscosity`

## Request

- Base URL: `https://www.deepmapai.com`
- URL: `https://www.deepmapai.com/api/v1/cross/post-seismic/viscosity`
- Auth: none declared

Estimate mantle viscosity from post-seismic frequency shift decay.

Measures frequency perturbation decay rate of normal modes after
nearby large earthquakes to constrain upper mantle viscosity
(normal: 10^20 to 10^21 Pa*s).

**Pricing:** Included in subscription tiers (legacy list price: GET /api/v1/billing/pricing).

## Query parameters

- `x_api_key` string, nullable

## Request body

- BodyPostSeismicViscosityApiV1CrossPostSeismicViscosityPost
  - `lat` number, required: Latitude for viscosity estimation
  - `lon` number, required: Longitude for viscosity estimation
  - `days` integer: Days of post-seismic data to use

## 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)