Filtering Earthquakes

Overview

The TerraQuake API provides multiple filtering methods to help you find exactly the earthquake data you need. This guide covers all available filtering options and when to use each one.

Filter Types

Time-based Filters

Time filters are the most common way to query earthquake data.

Today's Events
Recent Events
Last Week
Specific Month
Date Range

Returns all earthquakes that occurred today.

cURL

curl https://api.terraquakeapi.com/v1/earthquakes/today

Python

import requests

response = requests.get('https://api.terraquakeapi.com/v1/earthquakes/today')
earthquakes = response.json()
print(f"Found {earthquakes['totalEarthquakes']} events today")

JavaScript

const response = await fetch('https://api.terraquakeapi.com/v1/earthquakes/today');
const data = await response.json();
console.log(`Found ${data.totalEarthquakes} events today`);

Returns earthquakes from the start of the current year until today.

cURL

curl https://api.terraquakeapi.com/v1/earthquakes/recent

Python

import requests

response = requests.get('https://api.terraquakeapi.com/v1/earthquakes/recent')
data = response.json()

# Iterate through events
for event in data['payload']:
    print(f"{event['time']} - M{event['magnitude']} - {event['place']}")

JavaScript

const response = await fetch('https://api.terraquakeapi.com/v1/earthquakes/recent');
const data = await response.json();

data.payload.forEach(event => {
  console.log(`${event.time} - M${event.magnitude} - ${event.place}`);
});

Returns earthquakes from the last 7 days.

cURL

curl https://api.terraquakeapi.com/v1/earthquakes/last-week

Python

import requests

url = 'https://api.terraquakeapi.com/v1/earthquakes/last-week'
params = {'limit': 100, 'sort': '-magnitude'}

response = requests.get(url, params=params)
data = response.json()

print(f"Largest earthquake: M{data['payload'][0]['magnitude']}")

Query earthquakes for a specific month and year.

cURL

curl "https://api.terraquakeapi.com/v1/earthquakes/month?year=2024&month=3"

Python

import requests

url = 'https://api.terraquakeapi.com/v1/earthquakes/month'
params = {
    'year': 2024,
    'month': 3,
    'limit': 50
}

response = requests.get(url, params=params)
data = response.json()

JavaScript

const url = new URL('https://api.terraquakeapi.com/v1/earthquakes/month');
url.searchParams.set('year', '2024');
url.searchParams.set('month', '3');

const response = await fetch(url);
const data = await response.json();

Query earthquakes within a custom date range.

cURL

curl "https://api.terraquakeapi.com/v1/earthquakes/range?startdate=2024-01-01&enddate=2024-03-31"

Python

import requests

url = 'https://api.terraquakeapi.com/v1/earthquakes/range'
params = {
    'startdate': '2024-01-01',
    'enddate': '2024-03-31',
    'limit': 100
}

response = requests.get(url, params=params)
earthquakes = response.json()

Date format must be YYYY-MM-DD. Start date must be before or equal to end date.

Magnitude Filtering

Filter earthquakes by minimum magnitude to focus on significant events.

cURL

curl "https://api.terraquakeapi.com/v1/earthquakes/magnitude?mag=4.0"

Python

import requests

# Find all earthquakes above magnitude 4.0
url = 'https://api.terraquakeapi.com/v1/earthquakes/magnitude'
params = {'mag': 4.0, 'sort': '-magnitude'}

response = requests.get(url, params=params)
data = response.json()

print(f"Found {data['totalEarthquakes']} earthquakes >= M4.0")
for event in data['payload'][:5]:
    print(f"M{event['magnitude']} - {event['place']}")

JavaScript

const url = new URL('https://api.terraquakeapi.com/v1/earthquakes/magnitude');
url.searchParams.set('mag', '4.0');
url.searchParams.set('sort', '-magnitude');

const response = await fetch(url);
const data = await response.json();

console.log(`Found ${data.totalEarthquakes} earthquakes >= M4.0`);

The mag parameter represents the minimum magnitude threshold. Only earthquakes greater than this value will be returned.

Depth Filtering

Filter earthquakes by minimum depth to study shallow or deep events.

cURL

curl "https://api.terraquakeapi.com/v1/earthquakes/depth?depth=10"

Python

import requests

# Find deep earthquakes (>= 10km depth)
url = 'https://api.terraquakeapi.com/v1/earthquakes/depth'
params = {
    'depth': 10,
    'limit': 50,
    'sort': '-depth'
}

response = requests.get(url, params=params)
data = response.json()

# Analyze depth distribution
depths = [event['depth'] for event in data['payload']]
avg_depth = sum(depths) / len(depths)
print(f"Average depth: {avg_depth:.2f} km")

JavaScript

// Find shallow earthquakes (< 10km)
const response = await fetch(
  'https://api.terraquakeapi.com/v1/earthquakes/depth?depth=0&sort=depth',
);
const data = await response.json();

const shallowQuakes = data.payload.filter((e) => e.depth < 10);
console.log(`${shallowQuakes.length} shallow earthquakes found`);

Region Filtering

Filter earthquakes by Italian region using predefined bounding boxes.

cURL

curl "https://api.terraquakeapi.com/v1/earthquakes/region?region=Calabria"

Python

import requests

# Get earthquakes in Sicily
url = 'https://api.terraquakeapi.com/v1/earthquakes/region'
params = {
    'region': 'Sicilia',
    'limit': 100
}

response = requests.get(url, params=params)
data = response.json()

print(f"Earthquakes in Sicily: {data['totalEarthquakes']}")

JavaScript

const regions = ['Calabria', 'Sicilia', 'Campania'];

for (const region of regions) {
  const url = `https://api.terraquakeapi.com/v1/earthquakes/region?region=${region}`;
  const response = await fetch(url);
  const data = await response.json();
  console.log(`${region}: ${data.totalEarthquakes} earthquakes`);
}

See the Location Queries guide for the complete list of supported Italian regions.

Combining Multiple Filters

The /earthquakes/range endpoint supports combining time, magnitude, and depth filters.

Define your criteria

Determine what filters you need:

Time range (required)
Minimum magnitude (optional)
Maximum depth (optional)

Build the query

Python

import requests

url = 'https://api.terraquakeapi.com/v1/earthquakes/range'
params = {
    'startdate': '2024-01-01',
    'enddate': '2024-03-31',
    'minmag': 3.0,      # Minimum magnitude >= 3.0
    'maxdepth': 30,     # Maximum depth <= 30km
    'limit': 100
}

response = requests.get(url, params=params)
data = response.json()

JavaScript

const url = new URL('https://api.terraquakeapi.com/v1/earthquakes/range');
url.searchParams.set('startdate', '2024-01-01');
url.searchParams.set('enddate', '2024-03-31');
url.searchParams.set('minmag', '3.0');
url.searchParams.set('maxdepth', '30');

const response = await fetch(url);
const data = await response.json();

Process results

Python

# Filter and analyze combined results
significant_events = [
    event for event in data['payload']
    if event['magnitude'] >= 4.0
]

print(f"Total events: {data['totalEarthquakes']}")
print(f"Significant (M>=4): {len(significant_events)}")

Common Use Cases

Find Recent Major Earthquakes

Python

import requests

# Find earthquakes M >= 5.0 from the last week
url = 'https://api.terraquakeapi.com/v1/earthquakes/last-week'
params = {'limit': 100, 'sort': '-magnitude'}

response = requests.get(url, params=params)
data = response.json()

major_quakes = [
    event for event in data['payload']
    if event['magnitude'] >= 5.0
]

for quake in major_quakes:
    print(f"M{quake['magnitude']} - {quake['place']} - {quake['time']}")

Earthquakes in Specific Region Above Threshold

Python

import requests

# Find M >= 3.0 earthquakes in Calabria
url = 'https://api.terraquakeapi.com/v1/earthquakes/region'
params = {'region': 'Calabria', 'limit': 200}

response = requests.get(url, params=params)
data = response.json()

significant = [
    event for event in data['payload']
    if event['magnitude'] >= 3.0
]

print(f"Found {len(significant)} significant earthquakes in Calabria")

Deep vs Shallow Earthquakes

Python

import requests

url = 'https://api.terraquakeapi.com/v1/earthquakes/recent'
params = {'limit': 500}

response = requests.get(url, params=params)
data = response.json()

shallow = [e for e in data['payload'] if e['depth'] < 10]
intermediate = [e for e in data['payload'] if 10 <= e['depth'] < 70]
deep = [e for e in data['payload'] if e['depth'] >= 70]

print(f"Shallow (<10km): {len(shallow)}")
print(f"Intermediate (10-70km): {len(intermediate)}")
print(f"Deep (>=70km): {len(deep)}")

Performance Tips

Use Pagination

Always use limit and page parameters to avoid large responses:

?limit=50&page=1

Sort Results

Sort by relevant fields to get the most important data first: bash ?sort=-magnitude # Largest first ?sort=-time # Most recent first

Select Fields

Request only the fields you need: bash ?fields=time,magnitude,place

Cache Results

Cache responses for time-based queries that don’t change:

# Month data doesn't change
cache_ttl = 86400  # 24 hours

Filter Comparison Table

Filter Type	Endpoint	Best For	Time Range
Today	`/earthquakes/today`	Real-time monitoring	Current day
Recent	`/earthquakes/recent`	Current year analysis	Year to date
Last Week	`/earthquakes/last-week`	Weekly summaries	Last 7 days
Month	`/earthquakes/month`	Historical monthly data	Specific month
Date Range	`/earthquakes/range`	Custom analysis	Any range
Magnitude	`/earthquakes/magnitude`	Significant events	Year to date
Depth	`/earthquakes/depth`	Depth studies	Year to date
Region	`/earthquakes/region`	Regional monitoring	Year to date

Get Started

Core Concepts

Guides

Overview

Filter Types

Time-based Filters

Magnitude Filtering

Depth Filtering

Region Filtering

Combining Multiple Filters

Common Use Cases

Find Recent Major Earthquakes

Earthquakes in Specific Region Above Threshold

Deep vs Shallow Earthquakes

Performance Tips

Use Pagination

Sort Results

Select Fields

Cache Results

Filter Comparison Table

Next Steps

Location Queries

Best Practices

​Overview

​Filter Types

​Time-based Filters

​Magnitude Filtering

​Depth Filtering

​Region Filtering

​Combining Multiple Filters

​Common Use Cases

​Find Recent Major Earthquakes

​Earthquakes in Specific Region Above Threshold

​Deep vs Shallow Earthquakes

​Performance Tips

Use Pagination

Sort Results

Select Fields

Cache Results

​Filter Comparison Table

​Next Steps

Location Queries

Best Practices

Overview

Filter Types

Time-based Filters

Magnitude Filtering

Depth Filtering

Region Filtering

Combining Multiple Filters

Common Use Cases

Find Recent Major Earthquakes

Earthquakes in Specific Region Above Threshold

Deep vs Shallow Earthquakes

Performance Tips

Filter Comparison Table

Next Steps