Earthquake with magnitude of Md 3.0 on date 21-12-1985 and time 05:12:41 (Italy) in region Golfo di Napoli e Capri (Napoli)

A magnitude Md 3.0 earthquake occured in region: Golfo di Napoli e Capri (Napoli), on

  • 21-12-1985 04:12:41 (UTC)
  • 21-12-1985 05:12:41 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 40.8, 14.29 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
Ercolano NA 5 53709 53709
San Giorgio a Cremano NA 5 45557 99266
Napoli NA 6 974074 1073340
Portici NA 6 55274 1128614
Torre del Greco NA 6 86275 1214889
San Sebastiano al Vesuvio NA 8 9196 1224085
Cercola NA 9 18267 1242352
Massa di Somma NA 9 5444 1247796
Pollena Trocchia NA 10 13562 1261358
Volla NA 10 23755 1285113
Casavatore NA 11 18661 1303774
Casoria NA 12 77642 1381416
Sant'Anastasia NA 12 27671 1409087
Arzano NA 12 34886 1443973
Trecase NA 13 9097 1453070
Afragola NA 14 65057 1518127
Casalnuovo di Napoli NA 14 49855 1567982
Marano di Napoli NA 14 59874 1627856
Torre Annunziata NA 14 42789 1670645
Mugnano di Napoli NA 14 34828 1705473
Boscotrecase NA 15 10363 1715836
Melito di Napoli NA 15 37826 1753662
Somma Vesuviana NA 15 35233 1788895
Calvizzano NA 15 12329 1801224
Pomigliano d'Arco NA 15 39922 1841146
Quarto NA 15 40930 1882076
Sant'Antimo NA 16 33905 1915981
Casandrino NA 16 14336 1930317
Grumo Nevano NA 16 18061 1948378
Boscoreale NA 16 28072 1976450
Villaricca NA 16 31122 2007572
Frattamaggiore NA 16 30329 2037901
Giugliano in Campania NA 16 122974 2160875
Cardito NA 16 22755 2183630
Castello di Cisterna NA 16 7869 2191499
Ottaviano NA 17 23860 2215359
Crispano NA 17 12354 2227713
Frattaminore NA 17 16208 2243921
Brusciano NA 17 16466 2260387
Terzigno NA 17 18968 2279355
Caivano NA 18 37879 2317234
Acerra NA 18 59573 2376807
Pozzuoli NA 18 81661 2458468
Qualiano NA 18 25702 2484170
Bacoli NA 18 26560 2510730
Sant'Arpino CE 18 14307 2525037
San Giuseppe Vesuviano NA 19 30657 2555694
Pompei NA 19 25358 2581052
Orta di Atella CE 19 27191 2608243
Succivo CE 19 8457 2616700
Cesa CE 19 8841 2625541
Vico Equense NA 19 20969 2646510
Mariglianella NA 19 7787 2654297
Marigliano NA 20 30157 2684454
Castellammare di Stabia NA 20 66466 2750920

Municipalities with at least 50000 inhabitants

An earthquake occurred to
5 Km W of Ercolano (53709 inhabitants)
6 Km SE of Napoli (974074 inhabitants)
6 Km W of Portici (55274 inhabitants)
6 Km W of Torre del Greco (86275 inhabitants)
12 Km S of Casoria (77642 inhabitants)
14 Km S of Afragola (65057 inhabitants)
14 Km SE of Marano di Napoli (59874 inhabitants)
16 Km SE of Giugliano in Campania (122974 inhabitants)
18 Km SW of Acerra (59573 inhabitants)
18 Km E of Pozzuoli (81661 inhabitants)
20 Km NW of Castellammare di Stabia (66466 inhabitants)
21 Km SE of Aversa (53047 inhabitants)
21 Km W of Scafati (50787 inhabitants)
31 Km S of Caserta (76326 inhabitants)
37 Km W of Cava de' Tirreni (53659 inhabitants)
42 Km W of Salerno (135261 inhabitants)
44 Km W of Avellino (54857 inhabitants)
55 Km SW of Benevento (60091 inhabitants)
62 Km W of Battipaglia (50786 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 3.0 1985-12-21
04:12:41
40.8 14.29 10 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 18509
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-12-21 04:12:41 ± 0.394
Latitude 40.80 ± 0.02
Longitude 14.29 ± 0.05
Depth (km) 10 ± 8 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 18509

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) 4897.6
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 133
Number of associated phases, regardless of their use for origin computation 8
Number of defining phases 8
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.6
Epicentral distance of station closest to the epicenter (degree) 0.00073
Epicentral distance of station farthest from the epicenter (degree) 0.00777
Number of stations at which the event was observed 8
Number of stations from which data was used for origin computation 8
Magnitude information

Md:3

Field Value
Value 3
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 18509
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:21:16
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.DUI.Z. 1985-12-21T04:13:00.00 10.0 undecidable manual PG 8 0.0078 1.05 0.4
--.SGO.Z. 1985-12-21T04:12:58.00 10.0 undecidable manual PG 107 0.0072 0.15 1
--.TR9.Z. 1985-12-21T04:12:57.70 10.0 undecidable manual PG 70 0.0067 0.92 0.5
--.SGG.Z. 1985-12-21T04:12:53.00 10.0 undecidable manual PG 6 0.0053 -0.8 0.7
--.MSC.Z. 1985-12-21T04:12:50.10 10.0 undecidable manual PG 328 0.0041 -1.29 0.3
--.SOR.Z. 1985-12-21T04:12:46.90 10.0 positive manual PG 171 0.0019 -0.09 2.6
--.QR9.Z. 1985-12-21T04:12:46.50 10.0 undecidable manual PG 304 0.0011 1.12 0.5
--.OVO.Z. 1985-12-21T04:12:44.00 10.0 positive manual PG 72 0.0007 -0.52 2.1
TDMT - Time Domain Moment Tensor
Focal Mechanism in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download