Earthquake with magnitude of Md 3.1 on date 25-07-1985 and time 06:45:43 (Italy) in region 2 km NW Aielli (AQ)

A magnitude Md 3.1 earthquake occured in region: 2 km NW Aielli (AQ), on

  • 25-07-1985 04:45:43 (UTC)
  • 25-07-1985 06:45:43 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.0970, 13.5740 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
Aielli AQ 2 1475 1475
Celano AQ 2 11017 12492
Cerchio AQ 4 1635 14127
Collarmele AQ 6 894 15021
Ovindoli AQ 6 1227 16248
Pescina AQ 11 4133 20381
San Benedetto dei Marsi AQ 11 3909 24290
Secinaro AQ 11 359 24649
Gagliano Aterno AQ 11 254 24903
Tione degli Abruzzi AQ 13 310 25213
Rocca di Mezzo AQ 13 1526 26739
Castelvecchio Subequo AQ 13 982 27721
Castel di Ieri AQ 14 303 28024
Avezzano AQ 14 42515 70539
Molina Aterno AQ 15 386 70925
Massa d'Albe AQ 15 1476 72401
Acciano AQ 15 327 72728
Fontecchio AQ 15 369 73097
Trasacco AQ 16 6246 79343
Goriano Sicoli AQ 17 569 79912
Ortucchio AQ 17 1860 81772
Ortona dei Marsi AQ 17 542 82314
Rocca di Cambio AQ 17 533 82847
Magliano de' Marsi AQ 17 3690 86537
Luco dei Marsi AQ 17 6079 92616
Fagnano Alto AQ 18 418 93034
Cocullo AQ 18 230 93264
Gioia dei Marsi AQ 19 1989 95253
San Benedetto in Perillis AQ 19 113 95366
Caporciano AQ 19 230 95596
Raiano AQ 19 2815 98411
Scurcola Marsicana AQ 19 2824 101235
Villa Sant'Angelo AQ 20 424 101659

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km SE of L'Aquila (69753 inhabitants)
57 Km SW of Chieti (51815 inhabitants)
64 Km S of Teramo (54892 inhabitants)
66 Km E of Tivoli (56533 inhabitants)
66 Km SW of Montesilvano (53738 inhabitants)
67 Km SW of Pescara (121014 inhabitants)
71 Km E of Guidonia Montecelio (88673 inhabitants)
80 Km NE of Velletri (53303 inhabitants)
89 Km NE of Latina (125985 inhabitants)
92 Km SE of Terni (111501 inhabitants)
93 Km E of Roma (2864731 inhabitants)
95 Km NE 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 1985-07-25
04:45:43
42.097 13.574 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 10869
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-07-25 04:45:43 ± 0.37
Latitude 42.0970 ± 0.0247
Longitude 13.5740 ± 0.0463
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 10869

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) 4701.2
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 155
Number of associated phases, regardless of their use for origin computation 11
Number of defining phases 11
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) 0.00251
Epicentral distance of station farthest from the epicenter (degree) 0.01060
Number of stations at which the event was observed 7
Number of stations from which data was used for origin computation 7
Magnitude information

Md:3.1

Field Value
Value 3.1
Uncertainty
Num. used stations 4
Type of magnitude Md
Reference to an origin 10869
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:14:23
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.MNS.Z. 1985-07-25T04:46:07.00 10.0 undecidable manual SG 293 0.7215 -1.38 0.2
--.AS1.Z. 1985-07-25T04:46:07.00 10.0 undecidable manual PN 325 1.1766 1.43 0.2
--.ALP.Z. 1985-07-25T04:46:06.10 10.0 undecidable manual SG 359 0.6771 -1.07 0.2
--.PO9.Z. 1985-07-25T04:46:06.50 10.0 undecidable manual SG 315 0.666 -0.17 0.5
--.RDP.Z. 1985-07-25T04:45:59.00 10.0 undecidable manual PG 242 0.7215 1.2 0.4
--.MNS.Z. 1985-07-25T04:45:57.50 10.0 positive manual PG 293 0.7215 -0.29 2.5
--.ALP.Z. 1985-07-25T04:45:57.60 10.0 undecidable manual PG 359 0.6771 0.51 1.1
--.PO9.Z. 1985-07-25T04:45:56.50 10.0 undecidable manual PG 315 0.666 -0.31 1.3
--.AQU.Z. 1985-07-25T04:45:53.00 10.0 undecidable manual SG 333 0.2775 -1.45 0.1
--.SD1.Z. 1985-07-25T04:45:51.70 10.0 negative manual PG 155 0.4218 -0.62 2.1
--.AQU.Z. 1985-07-25T04:45:50.20 10.0 negative manual PG 333 0.2775 0.45 2.4
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