IRIS Knowledge Base

Category » Earthquakes

There were 12 articles found in this category:

1. How do I get data from the 2010 Maule earthquake?
   Q. How do I get portable station data from the 2010 Maule earthquake in Chile? A. Data from aftershock deployments are all available. The data from the French, British and US deployments are available through the IRIS DMC. They are available using the virtual network code _IMAD. Specific netwo ...
2. Historical Earthquake Archive
   SeismoArchives - Seismogram Archives of Significant Earthquakes of the World The main purpose of these SeismoArchives is to preserve historical seismograms and related materials in computer data files so that they are readily accessible online as source materials for research. SeismoArchives are ...
3. Where can I find information on recent earthquakes?
   Recent Earthquakes are listed on the IRIS homepage. You can also view a list of M5+ Earthquakes here. Seismic Monitor - Maps of recent earthquakes Seismic Monitor allows you to monitor global earthquakes in near real-time, visit seismic stations around the world, and search the web for earthqu ...
4. IRIS Earthquake Browser Help
   The IRIS Earthquake Browser is an interactive map service for viewing Earthquake Epicenters superimposed on a map of the world. Data can be exported from the earthquake browser and viewed in 3D with the GEON Integrated Data Viewer. The tool is useful for education or research projects. IEB is a ...
5. Why is there a time difference in reporting earthquakes?
   Question: I have been reading your charts for some time, but know I have come to ask you a question of where our activity may have come from. I am living in Honiara, Solomon Islands. We often feel tremors, but last night we had one at approximately 9 to 10.30 pm. Yet your charts indicates one ac ...
6. Erroneous earthquake entries
   Q: I see an inaccurate magnitude value for an earthquake that reads 9.7, for something that was only a 4.8. I see another quake that has been revised to an 8.8, but your IRIS listing still shows an 8.4. Why am I seeing this? A. The IRIS DMC attempts to store every earthquake catalog entry su ...
7. How do I interpret magnitudes and magnitude types?
   Earthquake Magnitude Descriptions Magnitudes can be based on any of the following: Mw - estimates of the seismic moment Mb - maximum amplitudes of teleseismic body waves Ms - surface waves Ml - local recordings Md - signal duration Q: What are the earthquake magnitude classes? A: Great; M > ...
8. When do you add data for aftershocks?
   Q: I'm looking for a Wells, NV aftershock that occurred on February 22 2008. How long does it typically take for you to post data? (I'm trying to download wave forms using Wilber II.) I noticed that for several days now, aftershocks from the preceding day are posted. A: WILBER is designed t ...
9. What are earthquake catalogs?
   Q. IRIS provides data from several earthquake catalogs. What are all of these catalogs and where do they come from? A. The catalogs are publications of earthquake origins and magnitudes from a particular institution. Many of these institutions update their catalogs on a regular basis. Some cat ...
10. Why is a recent earthquake not showing on Seismic Monitor?
    Q: An earthquake occured in New Zealand recently, but it is not displayed on the seismic map. Why are some earthquakes missing from Seismic Monitor? A: Seismic Monitor is an automated system with thresholds set for the display of earthquakes on a map. Locations and magnitudes are provided to I ...
11. What is UTC?
    UTC stands for Coordinated Universal Time. It is a time standard based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for variation in the Earth's rotation. Most of the data managed by the IRIS DMC uses UTC as a time base. Read more on Wikipedia
12. Is the number of earthquakes increasing?
    No, the number of earthquakes is not increasing compared with the recorded history, according to data from the US Geological Survey National Earthquake Information Center. See: Are Earthquakes Really on the Increase? The USGS estimates that several million earthquakes occur in the world each yea ...