Earthquake with magnitude of Md 3.1 on date 23-02-1985 and time 11:13:17 (Italy) in region 2 km NE Belmonte Castello (FR)

A magnitude Md 3.1 earthquake occured in region: 2 km NE Belmonte Castello (FR), on

  • 23-02-1985 10:13:17 (UTC)
  • 23-02-1985 11:13:17 (UTC +01:00) Italian time

and geographic coordinates (lat, lon) 41.5880, 13.8280 at 6 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
Belmonte Castello FR 2 739 739
Villa Latina FR 3 1241 1980
Atina FR 4 4316 6296
Terelle FR 6 422 6718
Sant'Elia Fiumerapido FR 6 6166 12884
Picinisco FR 7 1218 14102
Vallerotonda FR 8 1581 15683
Gallinaro FR 8 1269 16952
San Biagio Saracinisco FR 9 349 17301
Casalattico FR 9 574 17875
Settefrati FR 10 728 18603
Villa Santa Lucia FR 10 2632 21235
Cassino FR 11 36142 57377
Casalvieri FR 11 2698 60075
Acquafondata FR 12 263 60338
Piedimonte San Germano FR 12 6535 66873
Colle San Magno FR 12 699 67572
Castrocielo FR 13 3965 71537
Alvito FR 13 2713 74250
Cervaro FR 14 8109 82359
San Donato Val di Comino FR 14 2107 84466
Viticuso FR 14 353 84819
Roccasecca FR 14 7365 92184
Vicalvi FR 14 783 92967
Aquino FR 15 5370 98337
Fontechiari FR 16 1303 99640
Posta Fibreno FR 16 1139 100779
Santopadre FR 16 1357 102136
San Vittore del Lazio FR 16 2636 104772
Pignataro Interamna FR 17 2595 107367
Conca Casale IS 18 200 107567
Colfelice FR 19 1932 109499
San Pietro Infine CE 19 944 110443
Arpino FR 19 7262 117705
Pizzone IS 20 329 118034
Scapoli IS 20 680 118714
Filignano IS 20 648 119362
Pontecorvo FR 20 13242 132604

Municipalities with at least 50000 inhabitants

An earthquake occurred to
71 Km NW of Caserta (76326 inhabitants)
75 Km NW of Aversa (53047 inhabitants)
78 Km E of Latina (125985 inhabitants)
80 Km NW of Giugliano in Campania (122974 inhabitants)
82 Km NW of Marano di Napoli (59874 inhabitants)
84 Km NW of Afragola (65057 inhabitants)
85 Km NW of Acerra (59573 inhabitants)
85 Km NW of Casoria (77642 inhabitants)
85 Km N of Pozzuoli (81661 inhabitants)
88 Km E of Velletri (53303 inhabitants)
90 Km SW of Chieti (51815 inhabitants)
90 Km NW of Napoli (974074 inhabitants)
92 Km SE of L'Aquila (69753 inhabitants)
95 Km NW of Benevento (60091 inhabitants)
95 Km E of Tivoli (56533 inhabitants)
96 Km NW of Portici (55274 inhabitants)
97 Km NW of Ercolano (53709 inhabitants)
98 Km E of Aprilia (73446 inhabitants)
100 Km NW of Torre del Greco (86275 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 3.1 1985-02-23
10:13:17
41.588 13.828 6 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 2259
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-02-23 10:13:17 ± 0.531
Latitude 41.5880 ± 0.0319
Longitude 13.8280 ± 0.0423
Depth (km) 6 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 2259

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) 5001.4
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 144
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) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00105
Epicentral distance of station farthest from the epicenter (degree) 0.01538
Number of stations at which the event was observed 12
Number of stations from which data was used for origin computation 12
Magnitude information

Md:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations 2
Type of magnitude Md
Reference to an origin 2259
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:07:14
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.AS1.Z. 1985-02-23T10:14:08.50 10.0 undecidable manual SN 329 0.0154 -0.95 0.1
--.AS1.Z. 1985-02-23T10:13:47.50 10.0 undecidable manual PN 329 0.0154 0.18 1.1
--.CM8.Z. 1985-02-23T10:13:47.20 10.0 undecidable manual PN 342 0.0151 0.25 1.1
--.SGO.Z. 1985-02-23T10:13:45.50 10.0 undecidable manual PN 132 0.0136 0.84 0.5
--.PO9.Z. 1985-02-23T10:13:41.00 10.0 undecidable manual PN 326 0.0106 0.89 0.5
--.TR9.Z. 1985-02-23T10:13:40.50 10.0 undecidable manual PN 116 0.0106 0.41 1.2
--.MNS.Z. 1985-02-23T10:13:39.80 10.0 undecidable manual PN 313 0.0104 -0.05 1.5
--.BS1.Z. 1985-02-23T10:13:39.50 10.0 undecidable manual PN 136 0.0099 0.48 1.1
--.AQU.Z. 1985-02-23T10:13:34.00 10.0 undecidable manual PG 337 0.0074 -0.04 1.6
--.RDP.Z. 1985-02-23T10:13:33.40 10.0 undecidable manual PG 281 0.0076 -0.98 0.5
--.SGG.Z. 1985-02-23T10:13:26.40 10.0 undecidable manual PG 115 0.0041 -0.79 0.7
--.DUI.Z. 1985-02-23T10:13:26.50 10.0 undecidable manual PG 81 0.0042 -1.01 0.4
--.SD1.Z. 1985-02-23T10:13:22.80 10.0 undecidable manual SG 353 0.0011 0.63 0.6
--.SD1.Z. 1985-02-23T10:13:19.80 10.0 positive manual PG 353 0.0011 -0.22 3
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