Earthquake with magnitude of Md 2.3 on date 18-04-1985 and time 01:47:39 (UTC) in region 2 km SW Civitella del Tronto (TE)

A magnitude Md 2.3 earthquake occured in region: 2 km SW Civitella del Tronto (TE), on

  • 18-04-1985 01:47:39 (UTC)
  • 18-04-1985 03:47:39 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.76, 13.65 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Civitella del Tronto TE 2 5116 5116
Campli TE 5 7209 12325
Folignano AP 7 9241 21566
Maltignano AP 8 2401 23967
Sant'Egidio alla Vibrata TE 9 9811 33778
Ancarano TE 11 1857 35635
Ascoli Piceno AP 12 49407 85042
Torricella Sicura TE 12 2641 87683
Torano Nuovo TE 12 1611 89294
Teramo TE 12 54892 144186
Valle Castellana TE 13 977 145163
Sant'Omero TE 13 5243 150406
Bellante TE 13 7152 157558
Castel di Lama AP 13 8634 166192
Rocca Santa Maria TE 13 537 166729
Colli del Tronto AP 15 3668 170397
Appignano del Tronto AP 15 1785 172182
Nereto TE 15 5242 177424
Castorano AP 16 2380 179804
Corropoli TE 17 5045 184849
Castellalto TE 17 7513 192362
Spinetoli AP 17 7215 199577
Controguerra TE 17 2436 202013
Roccafluvione AP 18 2010 204023
Canzano TE 18 1934 205957
Venarotta AP 18 2066 208023
Monsampolo del Tronto AP 19 4611 212634
Cortino TE 20 656 213290
Offida AP 20 5058 218348
Castignano AP 20 2796 221144
Acquasanta Terme AP 20 2916 224060
Mosciano Sant'Angelo TE 20 9308 233368
Basciano TE 20 2434 235802
Montorio al Vomano TE 20 8218 244020

Municipalities with at least 50000 inhabitants

An earthquake occurred to
12 Km NW of Teramo (54892 inhabitants)
49 Km NW of Montesilvano (53738 inhabitants)
50 Km NE of L'Aquila (69753 inhabitants)
57 Km NW of Pescara (121014 inhabitants)
63 Km NW of Chieti (51815 inhabitants)
80 Km E of Foligno (57155 inhabitants)
85 Km E of Terni (111501 inhabitants)
96 Km S of Ancona (100861 inhabitants)
Recent and historical Seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Rev 1000 Md 2.3 1985-04-18
01:47:39
42.76 13.65 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 4839
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-18 01:47:39 ± 0.207
Latitude 42.76 ± 0.00
Longitude 13.65 ± 0.02
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4839

Uncertainty

Field Value
Preferred uncertainty description horizontal uncertainty
Semi-major axis of confidence ellipse (meter)
Semi-minor axis of confidence ellipse (meter)
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi)
Circular confidence region, given by single value of horizontal uncertainty (meter) 1837.5
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 271
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00049
Epicentral distance of station farthest from the epicenter (degree) 0.00704
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.3

Field Value
Value 2.3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 4839
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:09:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AQU.Z. 1985-04-18T01:47:56.00 10.0 undecidable manual SG 204 0.004 0.08 0.4
--.AS1.Z. 1985-04-18T01:47:55.50 10.0 undecidable manual PG 292 0.007 0.17 0.2
--.AQU.Z. 1985-04-18T01:47:49.00 10.0 undecidable manual PG 204 0.004 -0.03 1.3
--.ALP.Z. 1985-04-18T01:47:43.70 10.0 undecidable manual SG 285 0.0005 -0.14 0.4
--.ALP.Z. 1985-04-18T01:47:42.00 10.0 negative manual PG 285 0.0005 -0.05 2.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download