Earthquake with magnitude of Md 3.0 on date 06-04-1985 and time 21:15:26 (Italy) in region 5 km W Greccio (RI)

A magnitude Md 3.0 earthquake occured in region: 5 km W Greccio (RI), on

  • 06-04-1985 19:15:26 (UTC)
  • 06-04-1985 21:15:26 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.4730, 12.7150 at 9 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
Greccio RI 5 1558 1558
Stroncone TR 5 4917 6475
Colli sul Velino RI 6 533 7008
Cottanello RI 8 563 7571
Configni RI 8 633 8204
Contigliano RI 8 3783 11987
Labro RI 9 374 12361
Montasola RI 10 395 12756
Terni TR 11 111501 124257
Morro Reatino RI 11 373 124630
Vacone RI 12 256 124886
Rivodutri RI 13 1253 126139
Arrone TR 13 2763 128902
Rieti RI 14 47698 176600
Calvi dell'Umbria TR 14 1856 178456
Poggio Bustone RI 15 2055 180511
Torri in Sabina RI 15 1256 181767
Montefranco TR 15 1276 183043
Montebuono RI 15 883 183926
Casperia RI 15 1246 185172
Cantalice RI 16 2755 187927
Tarano RI 16 1444 189371
Polino TR 16 233 189604
Monte San Giovanni in Sabina RI 17 714 190318
Roccantica RI 17 563 190881
Narni TR 17 19785 210666
Ferentillo TR 18 1913 212579
Selci RI 19 1106 213685
Cantalupo in Sabina RI 19 1685 215370
Poggio Catino RI 20 1341 216711

Municipalities with at least 50000 inhabitants

An earthquake occurred to
11 Km SE of Terni (111501 inhabitants)
50 Km E of Viterbo (67173 inhabitants)
53 Km N of Guidonia Montecelio (88673 inhabitants)
54 Km S of Foligno (57155 inhabitants)
57 Km N of Tivoli (56533 inhabitants)
58 Km W of L'Aquila (69753 inhabitants)
67 Km N of Roma (2864731 inhabitants)
75 Km SE of Perugia (166134 inhabitants)
84 Km W of Teramo (54892 inhabitants)
87 Km E of Civitavecchia (52991 inhabitants)
87 Km NE of Fiumicino (78395 inhabitants)
88 Km N of Velletri (53303 inhabitants)
91 Km N of Pomezia (62966 inhabitants)
98 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 3.0 1985-04-06
19:15:26
42.473 12.715 9 2013-07-15
08:40:51
Bollettino Sismico Italiano INGV 4179
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-04-06 19:15:26 ± 0.235
Latitude 42.4730 ± 0.0119
Longitude 12.7150 ± 0.0243
Depth (km) 9 ± 2 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 4179

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) 2394.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 71
Number of associated phases, regardless of their use for origin computation 20
Number of defining phases 20
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) 0.03286
Number of stations at which the event was observed 13
Number of stations from which data was used for origin computation 13
Magnitude information

Md:3.0

Field Value
Value 3.0
Uncertainty
Num. used stations 8
Type of magnitude Md
Reference to an origin 4179
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 Takeoff_angle Residual Weight
--.CTI.Z. 1985-04-06T19:16:23.50 10.0 undecidable manual PN 348 0.0329 0.66 0.4
--.SD1.Z. 1985-04-06T19:16:04.50 10.0 undecidable manual SN 132 0.0100 0.71 0.3
--.AR1.Z. 1985-04-06T19:16:01.00 10.0 undecidable manual SG 9 0.0093 -0.92 0.4
--.RDP.Z. 1985-04-06T19:15:52.50 10.0 undecidable manual SG 179 0.0064 0.96 0.4
--.PRG.Z. 1985-04-06T19:15:50.00 10.0 undecidable manual SG 339 0.0060 -0.09 0.7
--.CH1.Z. 1985-04-06T19:15:49.50 10.0 undecidable manual PN 334 0.0115 -0.8 0.6
--.AS1.Z. 1985-04-06T19:15:49.00 10.0 undecidable manual SG 355 0.0053 1.45 0.2
--.MA1.Z. 1985-04-06T19:15:48.00 10.0 undecidable manual PN 267 0.0104 -0.52 0.9
--.SD1.Z. 1985-04-06T19:15:48.00 10.0 undecidable manual PN 132 0.0100 -0.01 1.1
--.AR1.Z. 1985-04-06T19:15:45.50 10.0 undecidable manual PG 9 0.0093 -1.43 0.3
--.PRG.Z. 1985-04-06T19:15:42.00 10.0 undecidable manual PG 339 0.0060 1.9 0.2
--.ALP.Z. 1985-04-06T19:15:40.30 10.0 undecidable manual PG 63 0.0062 -0.33 2.3
--.RDP.Z. 1985-04-06T19:15:40.50 10.0 positive manual PG 179 0.0064 -0.44 2.2
--.RMP.Z. 1985-04-06T19:15:40.50 10.0 undecidable manual PG 180 0.0059 0.54 2.1
--.AQU.Z. 1985-04-06T19:15:37.00 10.0 undecidable manual PG 102 0.0046 -0.34 1.2
--.AS1.Z. 1985-04-06T19:15:37.50 10.0 undecidable manual PG 355 0.0053 -1.13 1
--.PO9.Z. 1985-04-06T19:15:35.30 10.0 undecidable manual SG 58 0.0017 0.74 0.5
--.PO9.Z. 1985-04-06T19:15:31.50 10.0 positive manual PG 58 0.0017 0.38 2.3
--.MNS.Z. 1985-04-06T19:15:31.00 10.0 undecidable manual SG 195 0.0008 -0.1 0.7
--.MNS.Z. 1985-04-06T19:15:28.80 10.0 positive manual PG 195 0.0008 -0.34 2.3
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