Earthquake with magnitude of Md 4.0 on date 20-05-1985 and time 10:00:30 (UTC) in region 7 km S Lucoli (AQ)

A magnitude Md 4.0 earthquake occured in region: 7 km S Lucoli (AQ), on

  • 20-05-1985 10:00:30 (UTC)
  • 20-05-1985 12:00:30 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.2280, 13.3230 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
Lucoli AQ 7 1011 1011
Tornimparte AQ 7 3187 4198
Borgorose RI 8 4591 8789
Rocca di Cambio AQ 14 533 9322
Ocre AQ 14 1167 10489
Massa d'Albe AQ 14 1476 11965
Pescorocchiano RI 15 2075 14040
L'Aquila AQ 15 69753 83793
Magliano de' Marsi AQ 15 3690 87483
Fossa AQ 16 721 88204
Rocca di Mezzo AQ 16 1526 89730
Fiamignano RI 17 1413 91143
Sante Marie AQ 17 1166 92309
Scoppito AQ 17 3727 96036
Sant'Eusanio Forconese AQ 18 394 96430
Scurcola Marsicana AQ 18 2824 99254
Tagliacozzo AQ 18 6889 106143
Villa Sant'Angelo AQ 18 424 106567
Ovindoli AQ 19 1227 107794

Municipalities with at least 50000 inhabitants

An earthquake occurred to
15 Km SW of L'Aquila (69753 inhabitants)
52 Km NE of Tivoli (56533 inhabitants)
55 Km E of Guidonia Montecelio (88673 inhabitants)
57 Km SW of Teramo (54892 inhabitants)
67 Km SE of Terni (111501 inhabitants)
71 Km W of Chieti (51815 inhabitants)
75 Km NE of Velletri (53303 inhabitants)
75 Km W of Montesilvano (53738 inhabitants)
78 Km W of Pescara (121014 inhabitants)
79 Km E of Roma (2864731 inhabitants)
90 Km NE of Aprilia (73446 inhabitants)
91 Km NE of Latina (125985 inhabitants)
92 Km NE of Pomezia (62966 inhabitants)
96 Km SE of Foligno (57155 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 4.0
ML-VAX 3.7
1985-05-20
10:00:30
42.228 13.323 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 6739
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-05-20 10:00:30 ± 0.183
Latitude 42.2280 ± 0.0189
Longitude 13.3230 ± 0.0294
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 6739

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) 3204.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 79
Number of associated phases, regardless of their use for origin computation 40
Number of defining phases 40
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.8
Epicentral distance of station closest to the epicenter (degree) 0.00121
Epicentral distance of station farthest from the epicenter (degree) 0.05011
Number of stations at which the event was observed 34
Number of stations from which data was used for origin computation 34
Magnitudes information

Md:4.0

Field Value
Value 4.0
Uncertainty
Num. used stations 1
Type of magnitude Md
Reference to an origin 6739
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:11:02

ML:3.7

Field Value
Value 3.7
Uncertainty
Num. used stations 6
Type of magnitude ML
Reference to an origin 6739
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2015-04-28 13:07:13
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.SAL.Z. 1985-05-20T10:02:16.00 10.0 undecidable manual SN 330 0.0354 1.39 0.2
--.BN9.Z. 1985-05-20T10:01:55.00 10.0 undecidable manual PN 302 0.0501 1.82 0.2
--.SAL.Z. 1985-05-20T10:01:31.80 10.0 undecidable manual PN 330 0.0354 1.14 0.7
--.ORO.Z. 1985-05-20T10:01:47.00 10.0 undecidable manual PN 313 0.0461 -0.11 0.9
--.BD1.Z. 1985-05-20T10:01:46.80 10.0 undecidable manual SN 313 0.0243 1.39 0.2
--.STV.Z. 1985-05-20T10:01:44.60 10.0 undecidable manual PN 296 0.0432 1.91 0.2
--.BG1.Z. 1985-05-20T10:01:37.80 10.0 positive manual PN 325 0.0395 0.77 1.6
--.FO1.Z. 1985-05-20T10:01:36.50 10.0 positive manual PN 355 0.0394 -0.32 2
--.SGO.Z. 1985-05-20T10:01:35.50 10.0 undecidable manual SN 137 0.0201 1.26 0.4
--.RBL.Z. 1985-05-20T10:01:35.00 10.0 undecidable manual PN 2 0.0379 0.46 1
--.LCI.Z. 1985-05-20T10:01:33.50 10.0 undecidable manual PN 116 0.0365 1.03 0.7
--.CTI.Z. 1985-05-20T10:01:31.50 10.0 undecidable manual PN 343 0.0359 -0.12 1.1
--.GEN.Z. 1985-05-20T10:01:30.50 10.0 undecidable manual PN 306 0.0348 0.73 0.9
--.LJU.Z. 1985-05-20T10:01:30.60 10.0 undecidable manual PN 12 0.0351 0.24 1.1
--.VOY.Z. 1985-05-20T10:01:28.70 10.0 undecidable manual PN 5 0.0344 -0.47 1
--.CEY.Z. 1985-05-20T10:01:26.10 10.0 undecidable manual PN 12 0.0324 0.04 1.2
--.TRI.Z. 1985-05-20T10:01:24.00 10.0 undecidable manual PN 5 0.0314 -0.64 1
--.BVT.Z. 1985-05-20T10:01:24.00 10.0 undecidable manual PN 312 0.0305 0.7 1
--.MA1.Z. 1985-05-20T10:01:20.50 10.0 undecidable manual SN 277 0.0145 1.01 0.4
--.BRT.Z. 1985-05-20T10:01:20.50 10.0 undecidable manual PN 114 0.0284 0.38 1.2
--.BAI.Z. 1985-05-20T10:01:17.00 10.0 undecidable manual PN 111 0.0259 0.77 1
--.BD1.Z. 1985-05-20T10:01:14.30 10.0 undecidable manual PN 313 0.0243 0.5 1.2
--.PS9.Z. 1985-05-20T10:01:12.00 10.0 undecidable manual PN 307 0.0227 0.55 1.2
--.AR1.Z. 1985-05-20T10:01:12.40 10.0 undecidable manual SN 347 0.0117 0.37 0.8
--.FIR.Z. 1985-05-20T10:01:08.00 10.0 undecidable manual PN 316 0.0194 1.64 0.4
--.SGO.Z. 1985-05-20T10:01:07.50 10.0 positive manual PN 137 0.0201 0.14 2.7
--.MS1.Z. 1985-05-20T10:01:05.00 10.0 undecidable manual PN 104 0.0181 0.66 1.1
--.BS1.Z. 1985-05-20T10:01:02.00 10.0 negative manual PN 141 0.0165 0.11 2.7
--.SOR.Z. 1985-05-20T10:00:59.70 10.0 undecidable manual PN 154 0.0163 -1.84 0.3
--.OVO.Z. 1985-05-20T10:00:59.10 10.0 undecidable manual PN 149 0.0145 0.26 1.3
--.CH1.Z. 1985-05-20T10:00:59.80 10.0 positive manual PN 324 0.0155 -0.54 2.4
--.MA1.Z. 1985-05-20T10:00:58.90 10.0 undecidable manual PN 277 0.0145 0.06 1.4
--.MSC.Z. 1985-05-20T10:00:52.00 10.0 undecidable manual PN 154 0.0103 -0.37 1.3
--.AR1.Z. 1985-05-20T10:00:52.40 10.0 positive manual PN 347 0.0117 -2.13 0.4
--.AS1.Z. 1985-05-20T10:00:47.80 10.0 positive manual PG 329 0.0087 -1.89 0.6
--.RDP.Z. 1985-05-20T10:00:43.47 10.0 undecidable manual PG 224 0.0058 -0.31 1.3
--.SD1.Z. 1985-05-20T10:00:41.40 10.0 undecidable manual PG 144 0.0057 -2.05 0.2
--.MNS.Z. 1985-05-20T10:00:39.50 10.0 positive manual PG 288 0.0045 -1.5 1.1
--.AQU.Z. 1985-05-20T10:00:32.20 10.0 undecidable manual PG 24 0.0012 -2.11 0.2
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