Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of Md 3.4 on date 11-05-1987 and time 15:07:57 (UTC) in region 5 km E Rocca di Papa (RM)

A magnitude Md 3.4 earthquake occured in region: 5 km E Rocca di Papa (RM), on

  • 11-05-1987 15:07:57 (UTC)
  • 11-05-1987 17:07:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.7460, 12.7600 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
Rocca di Papa RM 5 17034 17034
Nemi RM 5 1943 18977
Rocca Priora RM 6 11962 30939
Lariano RM 6 13432 44371
Velletri RM 7 53303 97674
Genzano di Roma RM 7 23970 121644
Monte Compatri RM 7 11978 133622
Ariccia RM 8 19407 153029
Albano Laziale RM 9 41715 194744
Lanuvio RM 9 13632 208376
Monte Porzio Catone RM 9 8693 217069
Marino RM 9 43026 260095
Grottaferrata RM 9 20327 280422
Castel Gandolfo RM 9 8997 289419
San Cesareo RM 9 15153 304572
Frascati RM 9 22087 326659
Colonna RM 10 4287 330946
Labico RM 12 6379 337325
Zagarolo RM 12 17843 355168
Artena RM 13 14276 369444
Valmontone RM 14 15959 385403
Ciampino RM 15 38412 423815
Gallicano nel Lazio RM 15 6334 430149
Palestrina RM 15 21672 451821
Rocca Massima LT 15 1136 452957
Castel San Pietro Romano RM 16 902 453859
Cave RM 17 11287 465146
Cori LT 17 11065 476211
Cisterna di Latina LT 18 36868 513079
Rocca di Cave RM 19 377 513456
Aprilia LT 19 73446 586902
Poli RM 19 2418 589320

Municipalities with at least 50000 inhabitants

An earthquake occurred to
7 Km N of Velletri (53303 inhabitants)
19 Km NE of Aprilia (73446 inhabitants)
23 Km E of Pomezia (62966 inhabitants)
25 Km S of Tivoli (56533 inhabitants)
28 Km SE of Roma (2864731 inhabitants)
29 Km S of Guidonia Montecelio (88673 inhabitants)
33 Km NW of Latina (125985 inhabitants)
35 Km NE of Anzio (54211 inhabitants)
43 Km E of Fiumicino (78395 inhabitants)
86 Km SW of L'Aquila (69753 inhabitants)
89 Km E of Civitavecchia (52991 inhabitants)
91 Km S of Terni (111501 inhabitants)
92 Km SE of Viterbo (67173 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 3.4 1987-05-11
15:07:57		 41.746 12.76 8 2013-07-15
08:40:51		 Bollettino Sismico Italiano INGV 46819
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-05-11 15:07:57 ± 0.258
Latitude 41.7460 ± 0.0187
Longitude 12.7600 ± 0.0267
Depth (km) 8 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 46819

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) 3037.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 156
Number of associated phases, regardless of their use for origin computation 29
Number of defining phases 29
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.5
Epicentral distance of station closest to the epicenter (degree) 0.00024
Epicentral distance of station farthest from the epicenter (degree) 0.04962
Number of stations at which the event was observed 23
Number of stations from which data was used for origin computation 23
Magnitude information

Md:3.4

Field Value
Value 3.4
Uncertainty
Num. used stations 6
Type of magnitude Md
Reference to an origin 46819
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:45:58
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
--.BNI.Z. 1987-05-11T15:09:20.00 10.0 undecidable manual PN 308 5.5056 0.32 0.7
--.FVI.Z. 1987-05-11T15:09:11.50 10.0 undecidable manual PN 0 4.8285 1.02 0.3
--.RBL.Z. 1987-05-11T15:09:09.00 10.0 undecidable manual PN 6 4.7175 0.12 0.8
--.CTI.Z. 1987-05-11T15:09:04.60 10.0 undecidable manual PN 349 4.3623 0.6 0.6
--.TDS.Z. 1987-05-11T15:08:52.20 10.0 undecidable manual PN 126 3.4188 1.28 0.2
--.ORI.Z. 1987-05-11T15:08:49.00 10.0 undecidable manual PN 120 3.2523 0.3 1
--.ARV.Z. 1987-05-11T15:08:49.00 10.0 undecidable manual SN 4 1.7538 -1.4 0.1
--.BDI.Z. 1987-05-11T15:08:41.50 10.0 undecidable manual PN 326 2.7972 -0.98 0.4
--.CDM.Z. 1987-05-11T15:08:41.50 10.0 undecidable manual PN 103 2.7084 0.24 1.1
--.MGR.Z. 1987-05-11T15:08:39.70 10.0 undecidable manual PN 126 2.6418 -0.69 0.7
--.DUI.Z. 1987-05-11T15:08:38.00 10.0 undecidable manual SN 93 1.2654 -0.82 0.3
--.ASS.Z. 1987-05-11T15:08:38.50 10.0 undecidable manual SN 356 1.3098 -1.46 0.1
--.SGO.Z. 1987-05-11T15:08:35.00 10.0 undecidable manual PN 120 2.2422 0.07 1.3
--.CRE.Z. 1987-05-11T15:08:32.00 10.0 undecidable manual PN 342 1.9536 1.05 0.5
--.TR9.Z. 1987-05-11T15:08:31.70 10.0 positive manual PN 109 1.9758 0.55 2.1
--.ARV.Z. 1987-05-11T15:08:29.00 10.0 undecidable manual PN 4 1.7538 0.9 0.6
--.AQU.Z. 1987-05-11T15:08:26.00 10.0 undecidable manual SG 37 0.7659 1.32 0.1
--.SOR.Z. 1987-05-11T15:08:25.10 10.0 undecidable manual PN 133 1.6539 -1.68 0.1
--.CM8.Z. 1987-05-11T15:08:23.83 10.0 undecidable manual PN 10 1.4763 -0.4 1.2
--.ASS.Z. 1987-05-11T15:08:22.00 10.0 undecidable manual PN 356 1.3098 -0.07 2.8
--.DUI.Z. 1987-05-11T15:08:21.70 10.0 undecidable manual PN 93 1.2654 0.29 1.3
--.MNS.Z. 1987-05-11T15:08:21.00 10.0 undecidable manual SG 354 0.6327 0.52 0.6
--.SGG.Z. 1987-05-11T15:08:20.90 10.0 negative manual PN 105 1.2543 -0.41 2.4
--.AQU.Z. 1987-05-11T15:08:12.50 10.0 undecidable manual PG 37 0.7659 -0.75 0.8
--.MNS.Z. 1987-05-11T15:08:09.70 10.0 undecidable manual PG 354 0.6327 -1.12 0.4
--.CP9.Z. 1987-05-11T15:08:02.00 10.0 undecidable manual PG 51 0.1776 -0.04 2.8
--.RMP.Z. 1987-05-11T15:08:01.20 10.0 undecidable manual SG 326 0.0666 -0.55 0.6
--.RMP.Z. 1987-05-11T15:08:00.10 10.0 undecidable manual PG 326 0.0666 0.09 2.8
--.RDP.Z. 1987-05-11T15:07:59.50 10.0 undecidable manual PG 290 0.0222 0.07 1.5
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