Earthquake with magnitude of Md 3.1 on date 21-08-1985 and time 07:56:07 (Italy) in region 3 km W Castignano (AP)

A magnitude Md 3.1 earthquake occured in region: 3 km W Castignano (AP), on

  • 21-08-1985 05:56:07 (UTC)
  • 21-08-1985 07:56:07 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.93, 13.59 at 5 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
Castignano AP 3 2796 2796
Rotella AP 3 906 3702
Montedinove AP 4 488 4190
Montalto delle Marche AP 7 2122 6312
Appignano del Tronto AP 8 1785 8097
Force AP 8 1354 9451
Ascoli Piceno AP 9 49407 58858
Offida AP 9 5058 63916
Venarotta AP 9 2066 65982
Cossignano AP 10 978 66960
Montelparo FM 11 778 67738
Monte Rinaldo FM 11 379 68117
Palmiano AP 11 196 68313
Ortezzano FM 11 774 69087
Roccafluvione AP 12 2010 71097
Montefalcone Appennino FM 12 424 71521
Santa Vittoria in Matenano FM 12 1330 72851
Castorano AP 12 2380 75231
Castel di Lama AP 13 8634 83865
Folignano AP 13 9241 93106
Monteleone di Fermo FM 14 395 93501
Monte Vidon Combatte FM 14 433 93934
Maltignano AP 14 2401 96335
Carassai AP 14 1100 97435
Smerillo FM 14 365 97800
Comunanza AP 14 3166 100966
Colli del Tronto AP 15 3668 104634
Montottone FM 15 979 105613
Monsampietro Morico FM 15 659 106272
Sant'Egidio alla Vibrata TE 16 9811 116083
Spinetoli AP 16 7215 123298
Petritoli FM 16 2335 125633
Monte San Martino MC 16 765 126398
Ripatransone AP 16 4309 130707
Ancarano TE 17 1857 132564
Monsampolo del Tronto AP 17 4611 137175
Monte Giberto FM 18 801 137976
Belmonte Piceno FM 18 646 138622
Servigliano FM 18 2336 140958
Acquaviva Picena AP 19 3831 144789
Civitella del Tronto TE 19 5116 149905
Montefiore dell'Aso AP 19 2123 152028
Penna San Giovanni MC 19 1108 153136
Amandola FM 20 3629 156765
Torano Nuovo TE 20 1611 158376
Montefortino FM 20 1178 159554
Ponzano di Fermo FM 20 1674 161228
Grottazzolina FM 20 3398 164626

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km NW of Teramo (54892 inhabitants)
65 Km NW of Montesilvano (53738 inhabitants)
66 Km N of L'Aquila (69753 inhabitants)
72 Km E of Foligno (57155 inhabitants)
73 Km NW of Pescara (121014 inhabitants)
76 Km S of Ancona (100861 inhabitants)
80 Km NW of Chieti (51815 inhabitants)
87 Km E of Terni (111501 inhabitants)
99 Km E of Perugia (166134 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 3.1 1985-08-21
05:56:07
42.93 13.59 5 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 12149
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-08-21 05:56:07 ± 0.295
Latitude 42.93 ± 0.01
Longitude 13.59 ± 0.03
Depth (km) 5 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 12149

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) 2500.1
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 171
Number of associated phases, regardless of their use for origin computation 14
Number of defining phases 14
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.4
Epicentral distance of station closest to the epicenter (degree) 0.0013
Epicentral distance of station farthest from the epicenter (degree) 0.01109
Number of stations at which the event was observed 9
Number of stations from which data was used for origin computation 9
Magnitude information

Md:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 12149
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:15:26
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AR1.Z. 1985-08-21T05:56:36.00 10.0 undecidable manual SG 320 0.0066 1.61 0
--.AS1.Z. 1985-08-21T05:56:33.00 10.0 undecidable manual SG 281 0.0062 -0.09 0.6
--.SD1.Z. 1985-08-21T05:56:32.60 10.0 undecidable manual PN? 172 0.0111 0.89 0.1
--.PO9.Z. 1985-08-21T05:56:30.00 10.0 undecidable manual SG 233 0.0053 0.18 0.7
--.MNS.Z. 1985-08-21T05:56:26.00 10.0 undecidable manual PG 230 0.0077 0.45 1.1
--.CM2.Z. 1985-08-21T05:56:24.90 10.0 undecidable manual SG 308 0.0037 0.88 0.3
--.AR1.Z. 1985-08-21T05:56:23.50 10.0 undecidable manual PG 320 0.0066 0.29 1.4
--.AS1.Z. 1985-08-21T05:56:21.50 10.0 undecidable manual PG 281 0.0062 -0.96 0.4
--.AQU.Z. 1985-08-21T05:56:21.00 10.0 undecidable manual PG 193 0.0053 0.41 1.4
--.PO9.Z. 1985-08-21T05:56:20.50 10.0 undecidable manual PG 233 0.0053 -0.07 1.7
--.AM1.Z. 1985-08-21T05:56:20.90 10.0 undecidable manual PG 1 0.0055 -0.14 1.7
--.CM2.Z. 1985-08-21T05:56:16.60 10.0 negative manual PG 308 0.0037 -0.62 2
--.ALP.Z. 1985-08-21T05:56:13.80 10.0 undecidable manual SG 185 0.0013 -0.25 0.9
--.ALP.Z. 1985-08-21T05:56:11.30 10.0 undecidable manual PG 185 0.0013 -0.16 1.7
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
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