For all atmospheric, underground, and underwater nuclear explosions (known or suspected) conducted by 8 countries, the NEDB website provides:

1. Dates
2. Origin Times
3. Source Locations - seismic and ground truth
4. Published Source Metadata

1. Published Bulletin Data - ISC or REB with seismic station detections and phase picks
2. Seismic Magnitudes - ISC or REB mb
3. Seismic Travel Time Residuals for ISC initial P relative to predictions from preferred origins using IASP91

1. Recording Station Characteristics
2. Availability of Waveforms/Station Coverage
3. Waveform Selection and Preview Options
4. Waveform Downloads from Archive

1. Event or Groups of Events Map-Based Selection
2. Relative Event Source Locations and Comparisons
3. Compare Source Locations to Imagery Features (Ground Truth comparisons)
4. Locations of Seismic Stations Reporting the Event (Bulletin information)
5. Observed Travel Time Residuals
6. Recording Stations with Available Waveforms

NEDB data are accessed through table and map-based selection tools (hot buttons, drop-down menus, and pop-up data balloons).

GoogleMap tools display NEDB event locations on maps or imagery with options for zooming, panning, comparing and selecting.

GoogleMaps display region/subregion (test site) boundaries, lat/lon grids, and key/legend descriptions, which can be hidden (check boxes at top of map) when not in use.

Note that faster access to most of the NEDB data resources is provided if the GoogleMap display options ("Map Based Selection" and "show map") are turned off until needed.

Data selection from the NEDB can be re-initiated at any time by clicking the Nuclear Explosion Database text in the header.

Seven linked NEDB webpages provide a range of functionality and data display/retrieval options:

	NEDB Main Menu/Homepage -– menu-driven starting point for accessing the NEDB. NEDB Main Menu/Homepage event selection options can be combined to exercise a full range of data choices: Country (10 options)/Region (19 options)/Sub-Region (20 options). Date/Time Range (enter directly into table or select from calendar). Latitude/Longitude Bounds (min/max) can be entered in associated boxes. Event Size: Magnitude (mb min/max) bounds can be entered in associated boxes, returns events with preferred mb within range. Event Size: Yield range (kT min/max) can be entered in associated boxes, returns events with published preferred yield within range. Waveform Data Only chooses only nuclear explosions with archived waveform data. Source Type: Check box for Atmospheric, Underground, and/or Underwater explosions. Map Based Selection can be turned on for GoogleMap event displays with interactive options.
	Event List - table and map displays of events or groups of events. Event List provides information on the events selected by the NEDB Main menu. Scrolling over column headers describes what's available; clicking on the column header sorts the database for the selected column. For each event a set of preferred source parameters has been determined from analyses of the available published reports and metadata. In addition, links are provided to other NEDB database features. Data in the event list include responsible Country, Source Type, preferred Date/Time, preferred location (Lat/Lon), GT/ground truth category (estimated location uncertainty), preferred source Depth/Height, preferred Yield, mb (usually ISC), number of Waveforms available, event Name (USA, France, Soviet PNEs), seismic Bulletin information, and Metadata sources. Clicking the M-Icon in the far left column for any event provides a link to the interactive GoogleMap imagery view zoomed in and centered on the preferred event location. Clicking the Date/Time for any event provides a link to a list of alternative Origins (highlighting the preferred solution), with associated authority references, for the selected event and additional data access (described below). This feature can also be accessed from pop-up data balloon options in map displays. Clicking the Bulletin indicator for any event provides a link to seismic bulletin summary pages (either ISC or REB for more recent) corresponding to the selected event and additional data access (described below). Clicking the SourceData indicator for any event provides a link to a summary of pertinent published event source features with references to the authorities responsible for those parameters (see below). Clicking number of events in Waveforms column provides a link to availability and retrieval of digital waveform data from the selected event (see below). This feature can also be accessed from pop-up data balloon options in map displays.
	Event List > Origin List -– source origin information and map displays for individual events. Event List > Origin List provides a tabular view of source origin information (preferred and associated, e.g. ISC seismic location) reported from different authorities with reference links. Events may include multiple Origins based on reference information from different authorities. In some cases this origin information may not be complete from the individual authorities (e.g. some authorities give dates, times, and locations while others only provide origin dates and yields, or other parameter combinations). Clicking the show map box brings up an interactive GoogleMap imagery display zoomed in and centered on the preferred solution along with available associated solutions. Links are also provided to other NEDB database features, including Bulletin, SourceData, Time Residuals and Waveforms by clicking the associated column indicator (see above and below).
	Event List > ISC/REB Event Bulletin -– ISC/REB seismic bulletin data and station coverage maps for selected events. Event List > ISC/REB Event Bulletin provides a view of the ISC (or REB for more recent) seismic bulletin time, location, and reporting stations, including phase time picks and Jeffreys-Bullen travel time residuals (TRes) with respect to the bulletin seismic location and origin time for the selected events. Clicking the show map box brings up an interactive GoogleMap imagery display with the preferred location along with locations of all the ISC stations which detected/reported the event. Clicking on station symbols from the map provides a pop-up balloon with pertinent station information. Clicking a Sta name from the station list brings up a GoogleMap imagery display zoomed in and centered on the selected station with a pop-up balloon describing pertinent station data. Links are also provided to other NEDB database features, including Origin, SourceData, TimeResiduals and Waveforms by clicking on the associated column indicator (see above and below).
	Event List > SourceData - summary of source data and references for selected events. Event List > SourceData provides a summary of pertinent source parametric features, including surface Elevation, Maximum Yield (upper limit), emplacement Medium of the source, Water Level Depth (static water table), Collapse time Interval, Diameter, Depth, and Volume of the explosion Collapse Crater, Explosion Type Code, and the reference authorities. Many of these metadata source features are only available for USA underground explosions. Links are also provided to other NEDB database features, including Origin, Bulletin, TimeResiduals, and Waveforms by clicking on the associated column indicator (see above and below).
	Event List > IASP91 Time Residuals with Respect to Preferred Origin -– table and map displays of travel time residuals utilizing bulletin picks for selected events. Event List > IASPI91 Time Residuals with Respect to Preferred Origin provides seismic travel time residuals, based on the initial P phase (and S phase where reported) times at the stations reported in the Bulletin (ISC or REB, see above), measured relative to the predicted P (or S) times at those stations, based on preferred event location and origin time and using the IASPI91 travel time tables. The residual table lists the Sta station name, Phase name, ISC/REB Arrival Time, Delta distance, ESAZ event-to-station azimuth, SEAZ station-to-event azimuth with respect to the preferred origin location, and the calculated time residual, TimeRes. There is an option to sort on each of the columns. Calculated time residuals have been culled to eliminate picks for which the absolute value of TimeRes is greater than 10 seconds. This was done to remove stations with timing problems or bad phase picks while retaining physically meaningful differences. Clicking the show map box brings up an interactive GoogleMap imagery display with the preferred location along with locations of all the bulletin stations with the calculated first P residuals color-coded by sign and size. Clicking on station symbols from the map provides a pop-up balloon including the calculated residual value and other pertinent station information. Clicking the M-Icon in the far-left column for any station brings up a GoogleMap imagery display zoomed in and centered on the selected station with a pop-up balloon including the calculated residual value and other pertinent station information. Links are also provided to other NEDB database features, including Origin, Bulletin, SourceData and Waveforms by clicking on the associated column indicator (see above and below).
	Event List > Station List (# Stations with Waveforms) -– table/map/waveform displays of the station data available in archives for selected event with options to download. Event List > Station List (# stations with waveforms) provides a table with information on the preferred source solution along with the selected listing of station names STA of the stable network of stations for which digital waveform data are available from the RDSS data archive (including the stations which have commonly recorded the largest number of the NEDB nuclear explosions) and related information, including station location (Lat, Lon), distance Delta (Deg or Km) and Azimuth from the preferred explosion origin. The TRACE column to the right of the station name shows the initial waveform segment (selected designated channel, usually vertical for each station), with the IASP91 predicted P time aligned at zero along with P pick from the bulletin and including nominal regional (2 ~ 4 Hz) or teleseismic (1 ~ 2.5 Hz) filters, for the selected explosion-station combination. TRACE icons are shown for stations where the designated channel has a P signal which meets some basic QC requirements (e.g. waveform data within 90-second window surrounding predicted P time on broadband or short-period channel). Scrolling over the TRACE icon blows up the image. Although only designated channels (e.g. array center element) may be shown in TRACE column, more complete data sets from the station may be available for download. Clicking the show map box brings up an interactive GoogleMap imagery display with the preferred location along with locations of the selected stations which have digital waveform data in the archive at the time of the event. Clicking on station symbols from the map provides a pop-up balloon with pertinent station information. Clicking the M-Icon in the far-left column for any station brings up a GoogleMap imagery display zoomed in and centered on the selected station with a pop-up balloon including the pertinent station information. Checking the box to the left of the station name designates that station for retrieval of the corresponding digital waveforms. Clicking the View Waveforms button brings up the designated digital waveforms with an analysis tool which permits some simple processing (e.g. alternative filtering, realignment). Processing options enable (1) applying one of seven common bandpass filters (3rd-order Butterworth) to all channels ("All Chans") or only to selected channels, and (2) scaling ("Scale Up" or "Scale Down") trace by factors of two. The view window may also be panned left or right in 25% (single arrow) or 100% (double arrow) window length increments. Zoom option expands and contracts the displayed window length in factors of two. Links are also provided to other NEDB database features, including Origin, Bulletin, and TimeResiduals, and SourceData by clicking on the associated column indicator (see above).

NEDB Selection Process Examples (Sample scripts)

Example:	Event list based on Date/Time and Location (Lat/Lon) boundaries
Starting at the NEDB Main/Homepage menu. Type in "Date Range" "From: 1980/01/01 00:00:00 To: 1981/12/31 23:59:59". Type in "Lat/Lon Bounds" "Latitude Minimum 37.0 Maximum 38.0" and "Longitude Minimum -117.0 Maximum -116.0" (i.e. Pahute Mesa). Leave other options set at defaults. Click on "Submit Request". loading figure 1 ... loading figure 2 ...
Example:	Event list and map for group of underground explosions in selected country/region/subregion for a selected range of magnitudes
Starting at the NEDB Main/Homepage menu. Select from "Country" menu "USSR". Select from "Region" menu "Novaya Zemlya". Select from "Sub-Region" menu "Matochkin Shar". Type in "Event Size" "Magnitude (mb): Minimum 5.0 Maximum 6.5" and uncheck Yield box. For "Source Type" option uncheck "Atmospheric" and "Underwater" leaving "Underground" checked. Leave other options set at defaults. Click on "Submit Request". Click show map to display locations of explosions from table. Select and click on event in map display to show source information in pop-up balloon. loading figure 1 ... loading figure 2 ... loading figure 3 ... loading figure 4 ...
Example:	Map comparing relative explosion locations (ISC versus groundtruth) for a selected event
Starting at the NEDB Main/Homepage menu. Select from "Country" menu "China". Select from "Region" menu "Lop Nor". Select from "Sub-Region" menu "Lop Nor Shafts". Leave other opptions set at defaults. Click on "Submit Request". A list/table of events. "NEDB retrival: Event List", meeting the slection criteria will be returned. Click on the "Date/Time" for one of the events in the table (e.g. "1996/06/08 02:56:00") to show the preferred and alternative/associated locations (e.g. ISC location) for the event. A list/table "NEDB Retrieval: Origin List", of alternative event locations will be returned. Click on the "show map" option (to right of table) to view a GoogleMap image with preferred and alternative locations (e.g. ISC) shown in relation to surface features. Note that adjustment of the zoom level may be needed to show alternative locations that are close to the preferred location or far away (outside the nominal preferred map area). Zoom bar can be used to look more closely at surrounding surface features in imagery. loading figure 1 ... loading figure 2 ... loading figure 3 ... loading figure 4 ... loading figure 5 ... loading figure 6 ...
Example:	Bulletin data and P phase travel-time residuals
Starting at the NEDB Main/Homepage menu. Select from "Country" menu "United States". Select from "Region" menu "NTS". Select from "Sub-Region" menu "Pahute Mesa". Leave other options set at defaults. Click on "Submit Request". A list/table of events. "NEDB retrival: Event List", meeting the slection criteria will be returned. Scroll to the right in the 7th row of the table for event GREELEY and click on the "Bulletin" link in the column labeled "BULLETIN". A listing of the detecting stations, phase picks from the ISC seismic bulletin and Jeffreys-Bullen travel time residuals with respect to the bulletin seismic location and origin time, "NEDB Retrieval: ISC Event Bulletin", for the GREELEY explosion will be returned. In the table at the top of the page click on the "TimeRes" link in the column labeled "TIMERES". A table listing the stations from the ISC bulletin and their P-phase travel-time residuals, "NEDB Retrieval: IASPI91 Time Residuals with Respect to Preferred Solution", will be returned. Click on the "show map" option (to right of table) to view a GoogleMap image with reporting stations color coded. Select and click on station in map display to show station information in pop-up balloon. loading figure 1 ... loading figure 2 ... loading figure 3 ... loading figure 4 ... loading figure 5 ... loading figure 6 ...
Example:	Preview and retrieve waveforms for a selected event
Starting at the NEDB Main/Homepage menu. Select from "Country" menu "Korea, DPRO". Leave other options set at defaults. Click on "Submit Request". A table showing the 2006 North Korean nuclear test data will be returned. The table shows in the column labeled "Waveforms" the number of seismic stations for which digital waveform data are available from the archives. Click on the number ("57") in the "Waveforms" column to bring up the list of stations with waveforms. Scrolling over the "Trace" icon to the right of the station name shows a blow-up of the reference waveform for each station. Check the boxes to the left of the station names to select the stations for waveform retrieval. Clik on "View Waveforms" to see waveforms from selected stations with options for alternative filters and realignment of signals. loading figure 1 ... loading figure 2 ... loading figure 3 ... loading figure 4 ... loading figure 5 ...