Earthquake with magnitude of Md 2.0 on date 04-06-1987 and time 12:27:45 (Italy) in region 3 km SW Guidonia Montecelio (RM)

A magnitude Md 2.0 earthquake occured in region: 3 km SW Guidonia Montecelio (RM), on

  • 04-06-1987 10:27:45 (UTC)
  • 04-06-1987 12:27:45 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 41.9850, 12.7000 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
Guidonia Montecelio RM 3 88673 88673
Sant'Angelo Romano RM 6 5018 93691
Fonte Nuova RM 7 32562 126253
Mentana RM 8 22921 149174
Tivoli RM 9 56533 205707
Marcellina RM 10 7280 212987
Monterotondo RM 10 40830 253817
Palombara Sabina RM 11 13269 267086
San Polo dei Cavalieri RM 12 2992 270078
Castel Madama RM 14 7399 277477
Moricone RM 16 2650 280127
San Gregorio da Sassola RM 16 1619 281746
Gallicano nel Lazio RM 16 6334 288080
Vicovaro RM 16 4019 292099
Montelibretti RM 17 5323 297422
Colonna RM 17 4287 301709
Casape RM 18 744 302453
Monteflavio RM 18 1348 303801
Roccagiovine RM 18 263 304064
Monte Porzio Catone RM 19 8693 312757
Riano RM 19 10466 323223
Montorio Romano RM 19 1984 325207
Poli RM 19 2418 327625
Zagarolo RM 19 17843 345468
Mandela RM 19 917 346385
Licenza RM 20 1011 347396
Sambuci RM 20 925 348321
Monte Compatri RM 20 11978 360299
Frascati RM 20 22087 382386
San Cesareo RM 20 15153 397539

Municipalities with at least 50000 inhabitants

An earthquake occurred to
3 Km SW of Guidonia Montecelio (88673 inhabitants)
9 Km W of Tivoli (56533 inhabitants)
21 Km NE of Roma (2864731 inhabitants)
34 Km N of Velletri (53303 inhabitants)
39 Km NE of Pomezia (62966 inhabitants)
44 Km N of Aprilia (73446 inhabitants)
45 Km NE of Fiumicino (78395 inhabitants)
60 Km N of Latina (125985 inhabitants)
60 Km N of Anzio (54211 inhabitants)
64 Km S of Terni (111501 inhabitants)
69 Km SE of Viterbo (67173 inhabitants)
71 Km SW of L'Aquila (69753 inhabitants)
76 Km E of Civitavecchia (52991 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 2.0 1987-06-04
10:27:45
41.985 12.7 10 2013-07-15
08:41:04
Bollettino Sismico Italiano INGV 48649
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 1987-06-04 10:27:45 ± 0.686
Latitude 41.9850 ± 0.0339
Longitude 12.7000 ± 0.0347
Depth (km) 10 (operator assigned)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-VAX
Event type earthquake
Origin ID 48649

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) 4736.9
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 303
Number of associated phases, regardless of their use for origin computation 5
Number of defining phases 5
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.1
Epicentral distance of station closest to the epicenter (degree) 0.00154
Epicentral distance of station farthest from the epicenter (degree) 0.00202
Number of stations at which the event was observed 3
Number of stations from which data was used for origin computation 3
Magnitude information

Md:2.0

Field Value
Value 2.0
Uncertainty
Num. used stations 3
Type of magnitude Md
Reference to an origin 48649
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2013-01-04 17:47:31
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance Takeoff_angle Residual Weight
--.RDP.Z. 1987-06-04T10:27:54.50 10.0 undecidable manual SG 176 0.0020 -0.4 0
--.RMP.Z. 1987-06-04T10:27:53.50 10.0 undecidable manual SG 179 0.0015 0.3 0.2
--.RDP.Z. 1987-06-04T10:27:51.00 10.0 undecidable manual PG 176 0.0020 -0.02 1.6
--.CP9.Z. 1987-06-04T10:27:51.00 10.0 undecidable manual PG 123 0.0019 0.02 1.6
--.RMP.Z. 1987-06-04T10:27:50.00 10.0 undecidable manual PG 179 0.0015 -0.03 1.6
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