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) 40.8010, 14.2920 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
Somma Vesuviana NA 15 35233 1751069
Melito di Napoli NA 15 37826 1788895
Calvizzano NA 15 12329 1801224
Pomigliano d'Arco NA 15 39922 1841146
Quarto NA 15 40930 1882076
Casandrino NA 16 14336 1896412
Sant'Antimo NA 16 33905 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
Castello di Cisterna NA 16 7869 2168744
Cardito NA 16 22755 2191499
Ottaviano NA 17 23860 2215359
Crispano NA 17 12354 2227713
Terzigno NA 17 18968 2246681
Frattaminore NA 17 16208 2262889
Brusciano NA 17 16466 2279355
Caivano NA 18 37879 2317234
Pozzuoli NA 18 81661 2398895
Acerra NA 18 59573 2458468
Qualiano NA 18 25702 2484170
Sant'Arpino CE 18 14307 2498477
Bacoli NA 18 26560 2525037
Pompei NA 19 25358 2550395
San Giuseppe Vesuviano NA 19 30657 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

These maps show the seismic activity in different time intervals, before the seismic event to which they refer. Data reported in the first two maps come from the analysis carried out in real time by the personnel of the INGV Operating Rooms, immediately after each earthquake. The third map shows data from 1985 to the date of the earthquake: the locations are reviewed by the seismological analysts of the INGV Italian Seismic Bulletin (Bollettino Sismico Italiano dell’INGV). The localization parameters (hypocentral coordinates and magnitude) are the best possible estimate with the data available to the INGV, but are constantly updated according to further data that become available. The location and magnitude parameters, subsequently reviewed by seismological analysts, may vary.

Earthquakes of the 3 days preceding this event

Earthquakes of the 3 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 0.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 72 hours preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes of the 90 days preceding this event

Earthquakes of the 90 days preceding this event

This map shows the earthquake epicenters with magnitude ≥ 2.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, in the 90 days preceding this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes from 1985 to the date of the event

Earthquakes from 1985 to the date of the event

This map shows the earthquake epicenters with magnitude ≥ 3.0, localized with data recorded by the National Seismic Network and other collaborative networks both in Italy and in neighboring countries, from 1985 to the date of this event. The size of the circle indicates the different classes of magnitude. The colors indicate the different time intervals preceding the seismic event. The black and white star is the epicenter of the current earthquake.
Earthquakes since 1000 AD until 2019

Earthquakes since 1000 AD until 2019

This map shows the epicenters of the historical earthquakes catalogue CPT15 (Catalogo Parametrico dei Terremoti Italiani, 2015 version 3.0, https://doi.org/10.13127/cpti/cpti15.3) since 1000 AD until 2019. The size of the square indicates the different classes of magnitude. For earthquakes with magnitude ≥ 6.0, it is also shown the year of occurrence and the magnitude value. The black and white star is the epicenter of the current earthquake.
Seismic hazard

Seismic hazard maps provide probabilistic estimates of the earthquake ground shaking exceeding a given threshold in a given geographic region within a given time window. Thus, it is not a deterministic prediction - a target that may be never reached given the complexity of the earthquake physical phenomenon - nor of the maximum expected earthquake since this has extremely low probabilities to occur.

In 2004, it was published the seismic hazard map of Italy (http://zonesismiche.mi.ingv.it) that provides a picture of the most hazardous geographic regions. The seismic hazard map of Italy (GdL MPS, 2004; rif. Ordinanza PCM del 28 aprile 2006, n. 3519, All. 1b) provides the 10% probability of exceedance in 50 years of the horizontal acceleration at rock sites (i.e., Vs30>800 m/s; cat. A, 3.2.1 of the D.M. 14.09.2005).

The colours indicate the various values of the ground acceleration that have 10% to be exceeded within 50 years. In general, the colours associated to low values of acceleration refer to areas that are less hazardous and stronger earthquakes repeat less frequently although they may still occur.

Seismic hazard map

Seismic hazard map

This map shows the seismic hazard map of Italy for the region where the earthquake occurred.
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000
Md 3.0 1985-12-21
04:12:41
40.801 14.292 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 40.8010 ± 0.0238
Longitude 14.2920 ± 0.0490
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:3.0

Field Value
Value 3.0
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
--.QR9.Z. 1985-12-21T04:12:46.50 10.0 undecidable manual PG 304 0.0011 1.12 0.5
--.SOR.Z. 1985-12-21T04:12:46.90 10.0 positive manual PG 171 0.0019 -0.09 2.6
--.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
Fault Plane solutions in the area
Fault Plane solutions

Fault Plane solutions

The map reports the fault plane solutions for earthquakes in the region from 1977 to the date of this event. Red moment tensors are determined using the Regional Centroid Moment Tensor technique (RCMT, http://www.bo.ingv.it/RCMT) applied for earthquakes with magnitude larger than 4.5 in the Euro-Mediterranenan area. Occasionally, when a station azimuthal coverage exists RCMTs can be obtained also for earthquakes with magnitude down to 4.0. The gray moment tensors are obtained with the Time Domain Moment Tensor method (TDMT, http://terremoti.ingv.it/tdmt). This technique is applied to earthquakes with magnitude ML greater than 3.2, when it is possible. The size of symbols scales with the calculated moment magnitude Mw.
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download