Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.8 on date 01-05-1985 and time 16:57:36 (UTC) in region 2 km NW Offida (AP)

A magnitude Md 3.8 earthquake occured in region: 2 km NW Offida (AP), on

  • 01-05-1985 16:57:36 (UTC)
  • 01-05-1985 18:57:36 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9510, 13.6790 at 8 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.

Hai sentito il terremoto? Clicca qui

Did you feel it? Fill in the questionnaire.

Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Offida AP 2 5058 5058
Cossignano AP 4 978 6036
Castignano AP 5 2796 8832
Appignano del Tronto AP 6 1785 10617
Castorano AP 7 2380 12997
Montalto delle Marche AP 7 2122 15119
Montedinove AP 8 488 15607
Ripatransone AP 9 4309 19916
Carassai AP 9 1100 21016
Castel di Lama AP 10 8634 29650
Rotella AP 10 906 30556
Colli del Tronto AP 10 3668 34224
Spinetoli AP 10 7215 41439
Ortezzano FM 11 774 42213
Monsampolo del Tronto AP 11 4611 46824
Acquaviva Picena AP 11 3831 50655
Monte Vidon Combatte FM 12 433 51088
Monte Rinaldo FM 12 379 51467
Montefiore dell'Aso AP 13 2123 53590
Petritoli FM 13 2335 55925
Maltignano AP 13 2401 58326
Monteprandone AP 13 12655 70981
Ancarano TE 14 1857 72838
Ascoli Piceno AP 14 49407 122245
Montelparo FM 14 778 123023
Sant'Egidio alla Vibrata TE 14 9811 132834
Montottone FM 15 979 133813
Massignano AP 15 1638 135451
Folignano AP 15 9241 144692
Force AP 15 1354 146046
Monterubbiano FM 15 2230 148276
Controguerra TE 16 2436 150712
Moresco FM 16 598 151310
Grottammare AP 16 16006 167316
Monte Giberto FM 16 801 168117
Torano Nuovo TE 16 1611 169728
Monteleone di Fermo FM 16 395 170123
Monsampietro Morico FM 16 659 170782
Santa Vittoria in Matenano FM 17 1330 172112
San Benedetto del Tronto AP 17 47303 219415
Venarotta AP 17 2066 221481
Cupra Marittima AP 17 5398 226879
Ponzano di Fermo FM 17 1674 228553
Colonnella TE 18 3734 232287
Campofilone FM 18 1916 234203
Montefalcone Appennino FM 18 424 234627
Nereto TE 18 5242 239869
Corropoli TE 19 5045 244914
Palmiano AP 19 196 245110
Grottazzolina FM 19 3398 248508
Roccafluvione AP 19 2010 250518
Lapedona FM 19 1166 251684
Belmonte Piceno FM 19 646 252330
Altidona FM 20 3390 255720
Smerillo FM 20 365 256085
Civitella del Tronto TE 20 5116 261201

Municipalities with at least 50000 inhabitants

An earthquake occurred to
32 Km N of Teramo (54892 inhabitants)
62 Km NW of Montesilvano (53738 inhabitants)
70 Km NW of Pescara (121014 inhabitants)
70 Km NE of L'Aquila (69753 inhabitants)
75 Km S of Ancona (100861 inhabitants)
78 Km NW of Chieti (51815 inhabitants)
79 Km E of Foligno (57155 inhabitants)
95 Km E of Terni (111501 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 3.8 1985-05-01
16:57:36		 42.951 13.679 8 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 5719
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1985-05-01 16:57:36 ± 0.446
Latitude 42.9510 ± 0.0132
Longitude 13.6790 ± 0.0224
Depth (km) 8 ± 3 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 5719

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) 2346.8
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 62
Number of associated phases, regardless of their use for origin computation 49
Number of defining phases 49
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.7
Epicentral distance of station closest to the epicenter (degree) 0.00170
Epicentral distance of station farthest from the epicenter (degree) 0.04379
Number of stations at which the event was observed 39
Number of stations from which data was used for origin computation 39
Magnitude information

Md:3.8

Field Value
Value 3.8
Uncertainty
Num. used stations 9
Type of magnitude Md
Reference to an origin 5719
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:10:09
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.ORO.Z. 1985-05-01T16:59:42.00 10.0 undecidable manual SN 305 4.8618 -1.38 0.1
--.BRT.Z. 1985-05-01T16:59:06.00 10.0 undecidable manual SN 127 3.3078 -0.24 0.5
--.CEY.Z. 1985-05-01T16:58:55.00 10.0 undecidable manual SN 10 2.8305 0.06 0.5
--.STV.Z. 1985-05-01T16:58:50.00 10.0 undecidable manual PN 287 4.7619 1.68 0.2
--.ORO.Z. 1985-05-01T16:58:49.00 10.0 undecidable manual PN 305 4.8618 -0.7 0.7
--.CK1.Z. 1985-05-01T16:58:41.00 10.0 undecidable manual PN 292 4.1625 0.99 0.6
--.LCI.Z. 1985-05-01T16:58:40.30 10.0 undecidable manual PN 126 4.218 -0.41 0.9
--.BG1.Z. 1985-05-01T16:58:37.80 10.0 undecidable manual PN 316 3.9849 0.09 1
--.GEN.Z. 1985-05-01T16:58:35.00 10.0 undecidable manual PN 294 3.7185 1.07 0.6
--.SAR.Z. 1985-05-01T16:58:33.50 10.0 undecidable manual PN 73 3.5631 1.72 0.2
--.FO1.Z. 1985-05-01T16:58:33.00 10.0 undecidable manual PN 350 3.6852 -0.52 0.9
--.CO9.Z. 1985-05-01T16:58:33.00 10.0 undecidable manual PN 302 3.5409 1.52 0.3
--.ORI.Z. 1985-05-01T16:58:32.50 10.0 positive manual PN 143 3.5631 0.82 1.5
--.SAL.Z. 1985-05-01T16:58:30.80 10.0 undecidable manual PN 320 3.4743 0.2 1.1
--.RBL.Z. 1985-05-01T16:58:30.00 10.0 undecidable manual PN 358 3.4743 -0.68 0.9
--.CTI.Z. 1985-05-01T16:58:29.00 10.0 negative manual PN 335 3.4077 -0.68 1.8
--.BRT.Z. 1985-05-01T16:58:27.30 10.0 undecidable manual PN 127 3.3078 -0.95 0.7
--.VOY.Z. 1985-05-01T16:58:23.90 10.0 undecidable manual PN 2 3.0747 -1.2 0.5
--.BAI.Z. 1985-05-01T16:58:23.00 10.0 undecidable manual PN 126 2.997 -1.06 0.6
--.DUI.Z. 1985-05-01T16:58:22.50 10.0 undecidable manual SN 155 1.4097 1.38 0.3
--.RDP.Z. 1985-05-01T16:58:21.50 10.0 undecidable manual SN 211 1.3875 1 0.5
--.CEY.Z. 1985-05-01T16:58:21.90 10.0 undecidable manual PN 10 2.8305 0.17 1.3
--.SGO.Z. 1985-05-01T16:58:20.50 10.0 undecidable manual PN 152 2.6751 0.91 0.8
--.TRI.Z. 1985-05-01T16:58:19.50 10.0 undecidable manual PN 1 2.7528 -1.13 0.6
--.PS9.Z. 1985-05-01T16:58:17.30 10.0 undecidable manual PN 289 2.4087 1.31 0.5
--.SOR.Z. 1985-05-01T16:58:15.60 10.0 undecidable manual PN 168 2.4087 -0.38 1.3
--.BS1.Z. 1985-05-01T16:58:15.00 10.0 undecidable manual PN 158 2.331 0.14 1.4
--.SD1.Z. 1985-05-01T16:58:15.00 10.0 undecidable manual SN 175 1.2432 -2.11 0.1
--.TR9.Z. 1985-05-01T16:58:13.80 10.0 undecidable manual PN 148 2.22 0.46 1.2
--.FIR.Z. 1985-05-01T16:58:11.00 10.0 undecidable manual PN 295 1.9425 1.54 0.3
--.MS1.Z. 1985-05-01T16:58:10.40 10.0 positive manual PN 125 2.0757 -1.01 1.5
--.MA1.Z. 1985-05-01T16:58:10.00 10.0 undecidable manual PN 254 1.9203 0.71 1
--.MSC.Z. 1985-05-01T16:58:08.30 10.0 undecidable manual PN 172 1.7649 1.19 0.6
--.SGG.Z. 1985-05-01T16:58:05.70 10.0 negative manual PN 161 1.6428 0.3 2.7
--.DUI.Z. 1985-05-01T16:58:03.00 10.0 undecidable manual PN 155 1.4097 0.8 1
--.CH1.Z. 1985-05-01T16:58:03.00 10.0 negative manual PN 298 1.4208 0.6 2.3
--.AR1.Z. 1985-05-01T16:58:02.00 10.0 undecidable manual SG 315 0.7659 -1.32 0.2
--.RDP.Z. 1985-05-01T16:58:02.50 10.0 positive manual PN 211 1.3875 0.66 2.2
--.PO9.Z. 1985-05-01T16:57:59.50 10.0 undecidable manual SG 235 0.6549 -0.38 0.5
--.SD1.Z. 1985-05-01T16:57:59.00 10.0 undecidable manual PN 175 1.2432 -0.88 0.9
--.AQU.Z. 1985-05-01T16:57:57.00 10.0 undecidable manual SG 198 0.6327 -1.98 0.1
--.MNS.Z. 1985-05-01T16:57:53.70 10.0 negative manual PG 232 0.9213 -1.2 1.2
--.CM2.Z. 1985-05-01T16:57:52.50 10.0 undecidable manual SG 301 0.4551 -1 0.5
--.AR1.Z. 1985-05-01T16:57:51.50 10.0 negative manual PG 315 0.7659 -0.42 2.6
--.AS1.Z. 1985-05-01T16:57:51.30 10.0 undecidable manual PG 278 0.7548 -0.48 1.2
--.PO9.Z. 1985-05-01T16:57:49.80 10.0 negative manual PG 235 0.6549 -0.14 2.8
--.AQU.Z. 1985-05-01T16:57:48.00 10.0 undecidable manual PG 198 0.6327 -1.41 0.4
--.CM2.Z. 1985-05-01T16:57:46.20 10.0 negative manual PG 301 0.4551 -0.05 2.8
--.ALP.Z. 1985-05-01T16:57:41.10 10.0 negative manual PG 205 0.1887 0.27 2.7
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