Earthquake with magnitude of Md 3.1 on date 07-04-1985 and time 03:11:25 (Italy) in region 3 km SE Stroncone (TR)

A magnitude Md 3.1 earthquake occured in region: 3 km SE Stroncone (TR), on

  • 07-04-1985 01:11:25 (UTC)
  • 07-04-1985 03:11:25 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.4810, 12.6840 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
Stroncone TR 3 4917 4917
Configni RI 7 633 5550
Greccio RI 8 1558 7108
Colli sul Velino RI 8 533 7641
Cottanello RI 8 563 8204
Terni TR 10 111501 119705
Contigliano RI 10 3783 123488
Montasola RI 11 395 123883
Labro RI 11 374 124257
Vacone RI 11 256 124513
Calvi dell'Umbria TR 13 1856 126369
Morro Reatino RI 13 373 126742
Arrone TR 14 2763 129505
Narni TR 14 19785 149290
Montebuono RI 15 883 150173
Torri in Sabina RI 15 1256 151429
Rivodutri RI 15 1253 152682
Montefranco TR 15 1276 153958
Tarano RI 16 1444 155402
Casperia RI 16 1246 156648
Poggio Bustone RI 17 2055 158703
Rieti RI 17 47698 206401
Polino TR 18 233 206634
Roccantica RI 18 563 207197
Ferentillo TR 18 1913 209110
Otricoli TR 18 1869 210979
Cantalice RI 18 2755 213734
Selci RI 19 1106 214840
San Gemini TR 19 5018 219858
Monte San Giovanni in Sabina RI 19 714 220572
Collevecchio RI 19 1577 222149
Cantalupo in Sabina RI 19 1685 223834

Municipalities with at least 50000 inhabitants

An earthquake occurred to
10 Km SE of Terni (111501 inhabitants)
48 Km E of Viterbo (67173 inhabitants)
53 Km S of Foligno (57155 inhabitants)
54 Km N of Guidonia Montecelio (88673 inhabitants)
58 Km N of Tivoli (56533 inhabitants)
60 Km W of L'Aquila (69753 inhabitants)
67 Km N of Roma (2864731 inhabitants)
74 Km SE of Perugia (166134 inhabitants)
85 Km NE of Civitavecchia (52991 inhabitants)
86 Km W of Teramo (54892 inhabitants)
87 Km NE of Fiumicino (78395 inhabitants)
89 Km N of Velletri (53303 inhabitants)
91 Km N of Pomezia (62966 inhabitants)
99 Km N of Aprilia (73446 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 1985-04-07
01:11:25
42.481 12.684 5 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 4189
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-07 01:11:25 ± 0.226
Latitude 42.4810 ± 0.0086
Longitude 12.6840 ± 0.0206
Depth (km) 5 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4189

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) 1938.3
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 153
Number of associated phases, regardless of their use for origin computation 22
Number of defining phases 22
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) 0.00081
Epicentral distance of station farthest from the epicenter (degree) 0.03270
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 8
Type of magnitude Md
Reference to an origin 4189
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:08:50
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.CTI.Z. 1985-04-07T01:13:05.00 10.0 undecidable manual SN 348 3.6297 1.12 0.1
--.CTI.Z. 1985-04-07T01:12:23.00 10.0 undecidable manual PN 348 3.6297 0.65 0.4
--.SD1.Z. 1985-04-07T01:12:05.00 10.0 undecidable manual SN 132 1.1322 0.64 0.4
--.AR1.Z. 1985-04-07T01:12:01.50 10.0 undecidable manual SG 10 1.0212 -0.09 0.8
--.RMP.N. 1985-04-07T01:11:52.00 10.0 undecidable manual SG? 178 0.666 2.11 0
--.RDP.Z. 1985-04-07T01:11:51.50 10.0 undecidable manual SG 178 0.7215 -0.09 0.8
--.PRG.Z. 1985-04-07T01:11:49.00 10.0 undecidable manual SG 341 0.6438 -0.41 0.7
--.CH1.Z. 1985-04-07T01:11:49.00 10.0 undecidable manual PN 335 1.2543 -0.75 0.8
--.SD1.Z. 1985-04-07T01:11:48.50 10.0 undecidable manual PN 132 1.1322 0.52 1
--.AS1.Z. 1985-04-07T01:11:47.00 10.0 undecidable manual SG 357 0.5772 -0.06 0.8
--.AQU.Z. 1985-04-07T01:11:46.50 10.0 undecidable manual SG 103 0.5439 0.62 0.4
--.AR1.Z. 1985-04-07T01:11:45.50 10.0 undecidable manual PG 10 1.0212 -0.88 0.7
--.PRG.Z. 1985-04-07T01:11:41.00 10.0 undecidable manual PG 341 0.6438 1.65 0.4
--.RMP.Z. 1985-04-07T01:11:40.00 10.0 positive manual PG 178 0.666 0.37 2.5
--.ALP.Z. 1985-04-07T01:11:40.00 10.0 undecidable manual PG 64 0.7104 -0.47 2.4
--.RDP.Z. 1985-04-07T01:11:39.50 10.0 positive manual PG 178 0.7215 -1.11 1.1
--.AQU.Z. 1985-04-07T01:11:38.00 10.0 undecidable manual PG 103 0.5439 0.69 1
--.AS1.Z. 1985-04-07T01:11:37.00 10.0 undecidable manual PG 357 0.5772 -0.99 1.2
--.PO9.Z. 1985-04-07T01:11:33.80 10.0 undecidable manual SG 63 0.2109 -0.18 0.6
--.PO9.Z. 1985-04-07T01:11:30.80 10.0 undecidable manual PG 63 0.2109 0.36 1.3
--.MNS.Z. 1985-04-07T01:11:30.20 10.0 undecidable manual SG 181 0.0888 0.42 0.7
--.MNS.Z. 1985-04-07T01:11:28.00 10.0 positive manual PG 181 0.0888 -0.02 2.8
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, /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