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

# Post Seismic Decay

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

## Request

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

Track post-seismic relaxation via normal mode amplitude decay.

Fits elastic (fast, ~7 day) and viscous (slow, ~90 day) decay
components to mode amplitudes measured at intervals since the
event.

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

## Query parameters

- `x_api_key` string, nullable

## Request body

- BodyPostSeismicDecayApiV1CrossPostSeismicDecayPost
  - `event_id` string, required: USGS event ID
  - `days_since` integer: Days since event to analyze

## 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)